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Fresnel lens. A Fresnel lens ( ; ; or ) is a type of composite compact lens developed by the French physicist Augustin-Jean Fresnel (1788–1827) for use in lighthouses. It has been called "the invention that saved a million ships."The design allows the construction of lenses of large aperture and short focal length without the mass and volume of material that would be required by a lens of conventional design. A Fresnel lens can be made much thinner than a comparable conventional lens, in some cases taking the form of a flat sheet. The simpler dioptric (purely refractive) form of the lens.

Fresnel lens. was first proposed by Count Buffon and independently reinvented by Fresnel. The "catadioptric" form of the lens, entirely invented by Fresnel, has outer elements that use total internal reflection as well as refraction; it can capture more oblique light from a light source and add it to the beam of a lighthouse, making the light visible from greater distances.## Description.The Fresnel lens reduces the amount of material required compared to a conventional lens by dividing the lens into a set of concentric annular sections. An ideal Fresnel lens would have an infinite number of sections. In each section, the overall.

Fresnel lens. thickness is decreased compared to an equivalent simple lens. This effectively divides the continuous surface of a standard lens into a set of surfaces of the same curvature, with stepwise discontinuities between them.In some lenses, the curved surfaces are replaced with flat surfaces, with a different angle in each section. Such a lens can be regarded as an array of prisms arranged in a circular fashion with steeper prisms on the edges and a flat or slightly convex center. In the first (and largest) Fresnel lenses, each section was actually a separate prism. 'Single-piece' Fresnel lenses were later produced, being.

Fresnel lens. used for automobile headlamps, brake, parking, and turn signal lenses, and so on. In modern times, computer-controlled milling equipment (CNC) or 3-D printers might be used to manufacture more complex lenses.Fresnel lens design allows a substantial reduction in thickness (and thus mass and volume of material) at the expense of reducing the imaging quality of the lens, which is why precise imaging applications such as photography usually still use larger conventional lenses.Fresnel lenses are usually made of glass or plastic; their size varies from large (old historical lighthouses, meter size) to medium (book-reading aids, OHP viewgraph projectors) to small (TLR/SLR.

Fresnel lens. camera screens, micro-optics). In many cases they are very thin and flat, almost flexible, with thicknesses in the 1 to 5 (mm) range.Most modern Fresnel lenses consist only of refractive elements. Lighthouse lenses, however, tend to include both refracting and reflecting elements, the latter being "outside" the metal rings seen in the photographs. While the inner elements are sections of refractive lenses, the outer elements are reflecting prisms, each of which performs two refractions and one total internal reflection, avoiding the light loss that occurs in reflection from a silvered mirror.## Lighthouse lens sizes.Fresnel designed six sizes of lighthouse lenses,.

Fresnel lens. divided into four "orders" based on their size and focal length. In modern use, these are classified as first through sixth order. An intermediate size between third and fourth order was added later, as well as sizes above first order and below sixth.A first-order lens has a focal length of 920 (mm) and stands about 2.59 (m) high, and 1.8 (m) wide. The smallest (sixth) order has a focal length of 150 (mm) and a height of 433 (mm).The largest Fresnel lenses are called hyperradiant (or hyper-radial). One such lens was on hand when it was decided to build and.

Fresnel lens. outfit the Makapuu Point Light in Hawaii. Rather than order a new lens, the huge optic construction, 12 (ft) tall and with over a thousand prisms, was used there.## Types.There are two main types of Fresnel lens: "imaging" and "non-imaging". Imaging Fresnel lenses use segments with curved cross-sections and produce sharp images, while non-imaging lenses have segments with flat cross-sections, and do not produce sharp images. As the number of segments increases, the two types of lens become more similar to each other. In the abstract case of an infinite number of segments, the difference between curved and flat segments.

Fresnel lens. disappears.Spherical: A spherical Fresnel lens is equivalent to a simple spherical lens, using ring-shaped segments that are each a portion of a sphere, that all focus light on a single point. This type of lens produces a sharp image, although not quite as clear as the equivalent simple spherical lens due to diffraction at the edges of the ridges.Cylindrical: A cylindrical Fresnel lens is equivalent to a simple cylindrical lens, using straight segments with circular cross-section, focusing light on a single line. This type produces a sharp image, although not quite as clear as the equivalent simple cylindrical lens due.

Fresnel lens. to diffraction at the edges of the ridges.Spot: A non-imaging spot Fresnel lens uses ring-shaped segments with cross sections that are straight lines rather than circular arcs. Such a lens can focus light on a small spot, but does not produce a sharp image. These lenses have application in solar power, such as focusing sunlight on a solar panel. Fresnel lenses may be used as components of Köhler illumination optics resulting in very effective nonimaging optics Fresnel-Köhler (FK) solar concentrators.Linear: A non-imaging linear Fresnel lens uses straight segments whose cross sections are straight lines rather than arcs. These lenses focus.

Fresnel lens. light into a narrow band. They do not produce a sharp image, but can be used in solar power, such as for focusing sunlight on a pipe, to heat the water within.## Uses.## Imaging.Fresnel lenses are used as simple hand-held magnifiers. They are also used to correct several visual disorders, including ocular-motility disorders such as strabismus. Fresnel lenses have been used to increase the visual size of CRT displays in pocket televisions, notably the Sinclair TV80. They are also used in traffic lights.Fresnel lenses are used in left-hand-drive European lorries entering the UK and Republic of Ireland (and vice versa,.

Fresnel lens. right-hand-drive Irish and British trucks entering mainland Europe) to overcome the blind spots caused by the driver operating the lorry while sitting on the wrong side of the cab relative to the side of the road the car is on. They attach to the passenger-side window.Another automobile application of a Fresnel lens is a rear view enhancer, as the wide view angle of a lens attached to the rear window permits examining the scene behind a vehicle, particularly a tall or bluff-tailed one, more effectively than a rear-view mirror alone.Multi-focal Fresnel lenses are also used as a part of retina.

Fresnel lens. identification cameras, where they provide multiple in- and out-of-focus images of a fixation target inside the camera. For virtually all users, at least one of the images will be in focus, thus allowing correct eye alignment.Fresnel lenses have also been used in the field of popular entertainment. The British rock artist Peter Gabriel made use of them in his early solo live performances to magnify the size of his head, in contrast to the rest of his body, for dramatic and comic effect. In the Terry Gilliam film "Brazil", plastic Fresnel screens appear ostensibly as magnifiers for the small CRT.

Fresnel lens. monitors used throughout the offices of the Ministry of Information. However, they occasionally appear between the actors and the camera, distorting the scale and composition of the scene to humorous effect. The Pixar movie Wall-E features a Fresnel lens in the scenes where the protagonist watches the musical Hello, Dolly! magnified on an iPod.## Photography.Canon and Nikon have used Fresnel lenses to reduce the size of telephoto lenses. Photographic lenses that include Fresnel elements can be much shorter than corresponding conventional lens design. Nikon calls the technology "Phase Fresnel".The Polaroid SX-70 camera used a Fresnel reflector as part of its.

Fresnel lens. viewing system.View and large format cameras can utilize a Fresnel lens in conjunction with the ground glass, to increase the perceived brightness of the image projected by a lens onto the ground glass, thus aiding in adjusting focus and composition.## Illumination.High-quality glass Fresnel lenses were used in lighthouses, where they were considered state of the art in the late 19th and through the middle of the 20th centuries; most lighthouses have now retired glass Fresnel lenses from service and replaced them with much less expensive and more durable aerobeacons, which themselves often contain plastic Fresnel lenses. Lighthouse Fresnel lens systems.

Fresnel lens. typically include extra annular prismatic elements, arrayed in faceted domes above and below the central planar Fresnel, in order to catch all light emitted from the light source. The light path through these elements can include an internal reflection, rather than the simple refraction in the planar Fresnel element. These lenses conferred many practical benefits upon the designers, builders, and users of lighthouses and their illumination. Among other things, smaller lenses could fit into more compact spaces. Greater light transmission over longer distances, and varied patterns, made it possible to triangulate a position.Perhaps the most widespread use of Fresnel lenses,.

Fresnel lens. for a time, occurred in automobile headlamps, where they can shape the roughly parallel beam from the parabolic reflector to meet requirements for dipped and main-beam patterns, often both in the same headlamp unit (such as the European H4 design). For reasons of economy, weight, and impact resistance, newer cars have dispensed with glass Fresnel lenses, using multifaceted reflectors with plain polycarbonate lenses. However, Fresnel lenses continue in wide use in automobile tail, marker, and reversing lights.Glass Fresnel lenses also are used in lighting instruments for theatre and motion pictures (see Fresnel lantern); such instruments are often called simply "Fresnels".

Fresnel lens. The entire instrument consists of a metal housing, a reflector, a lamp assembly, and a Fresnel lens. Many Fresnel instruments allow the lamp to be moved relative to the lens' focal point, to increase or decrease the size of the light beam. As a result, they are very flexible, and can often produce a beam as narrow as 7° or as wide as 70°. The Fresnel lens produces a very soft-edged beam, so is often used as a wash light. A holder in front of the lens can hold a colored plastic film ("gel") to tint the light or wire.

Fresnel lens. screens or frosted plastic to diffuse it. The Fresnel lens is useful in the making of motion pictures not only because of its ability to focus the beam brighter than a typical lens, but also because the light is a relatively consistent intensity across the entire width of the beam of light.Aircraft carriers and naval air stations typically use Fresnel lenses in their optical landing systems. The "meatball" light aids the pilot in maintaining proper glide slope for the landing. In the center are amber and red lights composed of Fresnel lenses. Although the lights are always on, the angle.

Fresnel lens. of the lens from the pilot's point of view determines the color and position of the visible light. If the lights appear above the green horizontal bar, the pilot is too high. If it is below, the pilot is too low, and if the lights are red, the pilot is very low.Fresnel lenses are also commonly used in searchlights, spotlights, and flashlights.## Projection.The use of Fresnel lenses for image projection reduces image quality, so they tend to occur only where quality is not critical or where the bulk of a solid lens would be prohibitive. Cheap Fresnel lenses can be.

Fresnel lens. stamped or molded of transparent plastic and are used in overhead projectors and projection televisions.Fresnel lenses of different focal lengths (one collimator, and one collector) are used in commercial and DIY projection. The collimator lens has the lower focal length and is placed closer to the light source, and the collector lens, which focuses the light into the triplet lens, is placed after the projection image (an active matrix LCD panel in LCD projectors). Fresnel lenses are also used as collimators in overhead projectors.## Solar power.Since plastic Fresnel lenses can be made larger than glass lenses, as well as being.

Fresnel lens. much cheaper and lighter, they are used to concentrate sunlight for heating in solar cookers, in solar forges, and in solar collectors used to heat water for domestic use. They can also be used to generate steam or to power a Stirling engine.Fresnel lenses can concentrate sunlight onto solar cells with a ratio of almost 500:1. This allows the active solar-cell surface to be reduced, lowering cost and allowing the use of more efficient cells that would otherwise be too expensive. In the early 21st century, Fresnel reflectors began to be used in concentrating solar power (CSP) plants to concentrate.

Fresnel lens. solar energy. One application was to preheat water at the coal-fired Liddell Power Station, in Hunter Valley Australia.Fresnel lenses can be used to sinter sand, allowing 3D printing in glass.## History.## Forerunners.Augustin-Jean Fresnel was not the first person to focus a lighthouse beam using a lens. That distinction apparently belongs to the London glass-cutter Thomas Rogers, who proposed the idea to Trinity House in 1788. The first Rogers lenses, 53cm in diameter and 14cm thick at the center, were installed at the Old Lower Lighthouse at Portland Bill in 1789. Behind each lamp was a back-coated spherical glass mirror, which.

Fresnel lens. reflected rear radiation back through the lamp and into the lens. Further samples were installed at Howth Baily, North Foreland, and at least four other locations by 1804. But much of the light was wasted by absorption in the glass.Nor was Fresnel the first to suggest replacing a convex lens with a series of concentric annular prisms, to reduce weight and absorption. In 1748, Count Buffon proposed grinding such prisms as steps in a single piece of glass. In 1790 (although secondary sources give the date as 1773 or 1788), the Marquis de Condorcet suggested that it would be easier.

Fresnel lens. to make the annular sections separately and assemble them on a frame; but even that was impractical at the time. These designs were intended not for lighthouses, but for burning glasses. David Brewster, however, proposed a system similar to Condorcet's in 1811, and by 1820 was advocating its use in British lighthouses.## Fresnel's contributions.The French (Commission of Lighthouses) was established by Napoleon in 1811, and placed under the authority of Fresnel's employer, the Corps of Bridges and Roads. As the members of the commission were otherwise occupied, it achieved little in its early years. But on 21 June 1819—three months.

Fresnel lens. after winning the physics of the Academy of Sciences for his celebrated memoir on diffraction—Fresnel was "temporarily" seconded to the commission on the recommendation of François Arago (a member since 1813), to review possible improvements in lighthouse illumination.By the end of August 1819, unaware of the Buffon-Condorcet-Brewster proposal, Fresnel made his first presentation to the commission, recommending what he called ('lenses by steps') to replace the reflectors then in use, which reflected only about half of the incident light. Much to Fresnel's embarrassment, one of the assembled commissioners, Jacques Charles, recalled Buffon's suggestion. However, whereas Buffon's version was biconvex and.

Fresnel lens. in one piece, Fresnel's was plano-convex and made of multiple prisms for easier construction. With an official budget of 500 francs, Fresnel approached three manufacturers. The third, François Soleil, found a way to remove defects by reheating and remolding the glass. Arago assisted Fresnel with the design of a modified Argand lamp with concentric wicks (a concept that Fresnel attributed to Count Rumford), and accidentally discovered that fish glue was heat-resistant, making it suitable for use in the lens. The prototype, finished in March 1820, had a square lens panel 55cm on a side, containing 97 polygonal (not annular) prisms—and.

Fresnel lens. so impressed the Commission that Fresnel was asked for a full eight-panel version. This model, completed a year later in spite of insufficient funding, had panels 76cm square. In a public spectacle on the evening of 13 April 1821, it was demonstrated by comparison with the most recent reflectors, which it suddenly rendered obsolete.Soon after this demonstration, Fresnel published the idea that light, including apparently unpolarized light, consists exclusively of transverse waves, and went on to consider the implications for double refraction and partial reflection.Fresnel acknowledged the British lenses and Buffon's invention in a memoir read on 29 July 1822.

Fresnel lens. and printed in the same year. The date of that memoir may be the source of the claim that Fresnel's lighthouse advocacy began two years later than Brewster's; but the text makes it clear that Fresnel's involvement began no later than 1819.Fresnel's next lens was a rotating apparatus with eight "bull's-eye" panels, made in annular arcs by Saint-Gobain, giving eight rotating beams—to be seen by mariners as a periodic flash. Above and behind each main panel was a smaller, sloping bull's-eye panel of trapezoidal outline with trapezoidal elements. This refracted the light to a sloping plane mirror, which then reflected.

Fresnel lens. it horizontally, 7 degrees ahead of the main beam, increasing the duration of the flash. Below the main panels were 128 small mirrors arranged in four rings, stacked like the slats of a louver or Venetian blind. Each ring, shaped like a frustum of a cone, reflected the light to the horizon, giving a fainter steady light between the flashes. The official test, conducted on the unfinished on 20 August 1822, was witnessed by the Commission—and by Louis XVIII and his entourage—from 20 (mi) away. The apparatus was stored at Bordeaux for the winter, and then reassembled at Cordouan Lighthouse.

Fresnel lens. under Fresnel's supervision—in part by Fresnel's own hands. On 25 July 1823, the world's first lighthouse Fresnel lens was lit. As expected, the light was visible to the horizon, more than 20 (mi) out.The day before the test of the Cordouan lens in Paris, a committee of the Academy of Sciences reported on Fresnel's memoir and supplements on double refraction—which, although less well known to modern readers than his earlier work on diffraction, struck a more decisive blow for the wave theory of light. Between the test and the reassembly at Cordouan, Fresnel submitted his papers on photoelasticity (16 September.

Fresnel lens. 1822), elliptical and circular polarization and optical rotation (9 December), and partial reflection and total internal reflection (7 January 1823), essentially completing his reconstruction of physical optics on the transverse wave hypothesis. Shortly after the Cordouan lens was lit, Fresnel started coughing up blood.In May 1824, Fresnel was promoted to Secretary of the , becoming the first member of that body to draw a salary, albeit in the concurrent role of Engineer-in-Chief. Late that year, being increasingly ill, he curtailed his fundamental research and resigned his seasonal job as an examiner at the , in order to save his remaining.

Fresnel lens. time and energy for his lighthouse work.In the same year he designed the first "fixed" lens—for spreading light evenly around the horizon while minimizing waste above or below. Ideally the curved refracting surfaces would be segments of toroids about a common vertical axis, so that the dioptric panel would look like a cylindrical drum. If this was supplemented by reflecting (catoptric) rings above and below the refracting (dioptric) parts, the entire apparatus would look like a beehive. The second Fresnel lens to enter service was indeed a fixed lens, of third order, installed at Dunkirk by 1 February 1825. However,.

Fresnel lens. due to the difficulty of fabricating large toroidal prisms, this apparatus had a 16-sided polygonal plan.In 1825 Fresnel extended his fixed-lens design by adding a rotating array outside the fixed array. Each panel of the rotating array was to refract part of the fixed light from a horizontal fan into a narrow beam.Also in 1825, Fresnel unveiled the ('lighthouse map'), calling for a system of 51 lighthouses plus smaller harbor lights, in a hierarchy of lens sizes called "orders" (the first being the largest), with different characteristics to facilitate recognition: a constant light (from a fixed lens), one flash per.

Fresnel lens. minute (from a rotating lens with eight panels), and two per minute (16 panels).In late 1825, to reduce the loss of light in the reflecting elements, Fresnel proposed to replace each mirror with a catadioptric prism, through which the light would travel by refraction through the first surface, then total internal reflection off the second surface, then refraction through the third surface. The result was the lighthouse lens as we now know it. In 1826 he assembled a small model for use on the , but he did not live to see a full-sized version: he died on 14 July.

Fresnel lens. 1827, at the age of 39.## After Fresnel.The first stage of the development of lighthouse lenses after the death of Augustin Fresnel consisted in the implementation of his designs. This was driven in part by his younger brother Léonor—who, like Augustin, was trained as a civil engineer but, unlike Augustin, had a strong aptitude for management. Léonor entered the service of the Lighthouse Commission in 1825, and went on to succeed Augustin as Secretary.The first fixed lens to be constructed with toroidal prisms was a first-order apparatus designed by the Scottish engineer Alan Stevenson under the guidance of Léonor Fresnel,.

Fresnel lens. and fabricated by Isaac Cookson & Co. using French glass; it entered service at the Isle of May, Scotland, on 22 September 1836. The first large catadioptric lenses were made in 1842 for the lighthouses at Gravelines and Île Vierge, France; these were fixed third-order lenses whose catadioptric rings (made in segments) were one metre in diameter. Stevenson's first-order Skerryvore lens, lit in 1844, was only partly catadioptric; it was similar to the Cordouan lens except that the lower slats were replaced by French-made catadioptric prisms, while mirrors were retained at the top. The first "fully" catadioptric first-order lens, installed.

Fresnel lens. at Pointe d'Ailly in 1852, also gave eight rotating beams plus a fixed light at the bottom; but its top section had eight catadioptric panels focusing the light about 4 degrees ahead of the main beams, in order to lengthen the flashes. The first fully catadioptric lens with "purely revolving" beams—also of first order—was installed at Saint-Clément-des-Baleines in 1854, and marked the completion of Augustin Fresnel's original "Carte des Phares".Thomas Stevenson (younger brother of Alan) went a step beyond Fresnel with his "holophotal" lens, which focused the light radiated by the lamp in nearly all directions, forward or backward, into.

Fresnel lens. a single beam. The first version, described in 1849, consisted of a standard Fresnel bull's-eye lens, a paraboloidal reflector, and a rear hemispherical reflector (functionally equivalent to the Rogers mirror of 60 years earlier, except that it subtended a whole hemisphere). Light radiated into the forward hemisphere but missing the bull's-eye lens was deflected by the paraboloid into a parallel beam surrounding the bull's-eye lens, while light radiated into the backward hemisphere was reflected back through the lamp by the spherical reflector (as in Rogers' arrangement), to be collected by the forward components. The first unit was installed at North.

Fresnel lens. Harbour, Peterhead, in August 1849. Stevenson called this version a "catadioptric holophote", although each of its elements was either purely reflective or purely refractive. In the second version of the holophote concept, the bull's-eye lens and paraboloidal reflector were replaced by a catadioptric Fresnel lens—as conceived by Fresnel, but expanded to cover the whole forward hemisphere. The third version, which Stevenson confusingly called a "dioptric holophote", was more innovative: it retained the catadioptric Fresnel lens for the front hemisphere, but replaced the rear hemispherical reflector with a hemispherical array of annular prisms, each of which used "two" total internal reflections.

Fresnel lens. to turn light diverging from the center of the hemisphere back toward the center. The result was an all-glass holophote, with no losses from metallic reflections.James Timmins Chance modified Thomas Stevenson's all-glass holophotal design by arranging the double-reflecting prisms about a vertical axis. The prototype was shown at the 1862 International Exhibition in London. Later, to ease manufacturing, Chance divided the prisms into segments, and arranged them in a cylindrical form while retaining the property of reflecting light from a single point back to that point. Reflectors of this form, paradoxically called "dioptric mirrors", proved particularly useful for returning light.

Fresnel lens. from the landward side of the lamp to the seaward side.As lighthouses proliferated, they became harder to distinguish from each other, leading to the use of colored filters, which wasted light. In 1884, John Hopkinson eliminated the need for filters by inventing the "group-flashing" lens, in which the dioptric and/or the catadioptric panels were split so as to give multiple flashes—allowing lighthouses to be identified not only by frequency of flashes, but also by multiplicity of flashes. Double-flashing lenses were installed at Tampico (Mexico) and Little Basses (Sri Lanka) in 1875, and a triple-flashing lens at Casquets Lighthouse (Channel Islands).

Fresnel lens. in 1876. The example shown (right) is the double-flashing lens of the Point Arena Light, which was in service from 1908 to 1977.The development of hyper-radial lenses was driven in part by the need for larger light sources, such as gas lights with multiple jets, which required a longer focal length for a given beam-width, hence a larger lens to collect a given fraction of the generated light. The first hyper-radial lens was built for the Stevensons in 1885 by F. Barbier & Cie of France, and tested at South Foreland Lighthouse with various light sources. Chance Brothers (Hopkinson's employers).

Fresnel lens. then began constructing hyper-radials, installing their first at Bishop Rock Lighthouse in 1887. In the same year, Barbier installed a hyper-radial at Tory Island. But only about 30 hyper-radials went into service before the development of more compact bright lamps rendered such large optics unnecessary (see "Hyperradiant Fresnel lens").Production of one-piece stepped dioptric lenses—roughly as envisaged by Buffon—became feasible in 1852, when John L. Gilliland of the Brooklyn Flint-Glass Company patented a method of making lenses from pressed and molded glass. The company made small bull's-eye lenses for use on railroads, steamboats, and docks; such lenses were common in the.

Fresnel lens. United States by the 1870s. In 1858 the company produced "a very small number of pressed flint-glass sixth-order lenses" for use in lighthouses—the first Fresnel lighthouse lenses made in America. By the 1950s, the substitution of plastic for glass made it economic to use Fresnel lenses as condensers in overhead projectors. Fresnel imager Fresnel zone plate Lenticular lens Linear Fresnel reflector Prism lighting − Fresnel anidolic optics M. Born and E. Wolf, "Principles of Optics", 7th Ed., Cambridge, 1999. G.-A. Boutry, 1948, "Augustin Fresnel: His time, life and work, 1788–1827", "Science Progress", vol. 36, no. 144 (October 1948), pp. 587–604;.

Fresnel lens. jstor.org/stable/43413515. J.Z. Buchwald, 1989, "The Rise of the Wave Theory of Light: Optical Theory and Experiment in the Early Nineteenth Century", University of Chicago Press, . J. Elton, 2009, "A Light to Lighten our Darkness: Lighthouse Optics and the Later Development of Fresnel's Revolutionary Refracting Lens 1780–1900", "International Journal for the History of Engineering & Technology", vol. 79, no. 2 (July 2009), pp. 183–244; . A. Fresnel, 1822, "Mémoire sur un nouveau système d'éclairage des phares", read 29 July 1822; reprinted in Fresnel, 1866–70, vol. 3, pp. 97–126; translated by T. Tag as "Memoir upon a new system of lighthouse.

Fresnel lens. illumination", U.S. Lighthouse Society, accessed 26 August 2017; archived 19 August 2016. (Cited page numbers refer to the translation.) A. Fresnel (ed. H. de Sénarmont, E. Verdet, and L. Fresnel), 1866–70, "Oeuvres complètes d'Augustin Fresnel" (3 vols.), Paris: Imprimerie Impériale; vol. 1 (1866), vol. 2 (1868), vol. 3 (1870). T.H. Levitt, 2013, "A Short Bright Flash: Augustin Fresnel and the Birth of the Modern Lighthouse", New York: W.W. Norton, . T. Young (ed. G. Peacock), 1855, "Miscellaneous Works of the late Thomas Young", London: J. Murray, vol. 1. "The Fresnel Lens", "The Keeper's Log", Winter 1985, pp. 12–14. U.S. Coast.

Fresnel lens. Guard, "Aids to Navigation", Washington, DC: U.S. Government Printing Office, 1945. U.S. Coast Guard, "Lighthouses, Lenses, Illuminants, Engineering, & Augustin Fresnel: A Historical Bibliography on Works Published Through 2007". United States Lighthouse Society, especially "Fresnel Lenses". W.A. Britten, "The Fresnel lens" (with photographs). J. Francis, "Fresnel Lens - Maxwell Simulation", 13 April 2009. J. Hare, "How the Fresnel lens works" (5-minute video), Vega Science Trust, 2008.


Question: How many elevators does this have?

Instruction: Retrieve a Wikipedia paragraph that provides an answer to the given query about the image.

30 St Mary Axe. accepted.## Planning process.John Prescott, the Deputy Prime Minister, granted planning permission on 23 August 2000 to construct a building on the site, which would be much larger than the old Exchange. The site needed development, was not on any of the "sight lines" (planning guidance requires that new buildings do not obstruct or detract from the view of St Paul's Cathedral dome when viewed from a number of locations around London), and had housed the Baltic Exchange.The plan for the site was to reconstruct the Baltic Exchange. GMW Architects proposed a new rectangular building surrounding a restored exchange: it would.


Question: For the animal in the image, what do they commonly eat?

Instruction: Determine the Wikipedia snippet that matches the question of this image.

Slow worm. The slow worm (Anguis fragilis) is a reptile native to western Eurasia. It is also called a deaf adder, a slowworm, a blindworm, or regionally, a long-cripple. These legless lizards are also sometimes called common slowworms. The "blind" in blindworm refers to the lizard's small eyes, similar to a blindsnake (although the slowworm's eyes are functional).Slow worms are semifossorial (burrowing) lizards, spending much of their time hiding underneath objects. The skin of slow worms is smooth with scales that do not overlap one another. Like many other lizards, they autotomize, meaning that they have the ability to shed their tails.

Slow worm. to escape predators. While the tail regrows, it does not reach its original length. In the UK, they are common in gardens and allotments, and can be encouraged to enter and help remove pest insects by placing black plastic or providing places to shelter such as piles of logs, corrugated iron sheets or under tiles. On warm days, one or more slow worms can often be found underneath these heat collectors. One of the biggest causes of mortality in slow worms in suburban areas is the domestic cat, against which it has no defence.Slow worms have been shown to be.

Slow worm. a species complex, consisting of 5 distinct but similar species.## Taxonomy."Anguis fragilis" was traditionally divided into two subspecies ("A. f. fragilis" and "A. f. colchica"), but they are now classified as separate species: Anguis fragilis" "sensu stricto (found in western Europe, northern Europe and western Balkans) and Anguis colchica (found in eastern Europe, eastern Balkans and in western Asia).Three more species were later distinguished from "A. fragilis": Anguis graeca (found in southern Balkans) and Anguis veronensis (found on the Apennine Peninsula).Anguis cephalonica (native to the Peloponnese Peninsula)## Physical traits.Slow worms have an elongated body with a circular cross-section without limbs.

Slow worm. and reach a maximum length of up to 57.5 cm. Most of the adult animals that can be observed are between 40 and 45 cm long, with up to 22 cm on the head and trunk section and the rest on the tail. There is no visible neck. The tail, which ends in a horny tip, is continuous with the trunk and is often slightly longer. Slow worms exhibit caudal autotomy, the severing of the tail when it is pulled by predators. When regrown the tail only grows back to a short stub.The skin surface consists of smooth, round-to-hexagonal scales.

Slow worm. which overlap like roof tiles and which are roughly the same shape on the dorsal and ventral surfaces of the body. There are several longitudinal rows running along the underside. In total, the trunk has 125 to 150 transverse scale rows and the tail has another 130 to 160 rows. Under the scales there are bony plates (osteoderms), which means that slow worms crawl much more stiffly and clumsily than snakes. The scaling of the head is similar to that of other lizards. The ear openings are mostly completely hidden under the scales. The relatively small eyes have movable, closable.

Slow worm. eyelids (these are fused in snakes) and round pupils. The rather short tongue is broad, bilobed and does not end in fine tips. To lick, i.e. to absorb odorous substances, slow worms have to open their mouths slightly, as they lack the gap in the upper lip that snakes possess. The pointed, sometimes quite loosely fixed teeth are curved backwards; there are 7 to 9 teeth in the premaxilla, 10 to 12 in the maxilla and 14 to 16 in the lower jaw.## Reproduction.In Central Europe, the mating season of the species is usually between the end of April and.

Slow worm. June. The males wrestle often violently around the females, although in most populations they are in the majority. The opponents try to push each other to the ground, bite each other and wrap themselves tightly around each other. When mating, the female is bitten in the head or neck region, while the male introduces his two hemipenes into the female's cloaca. Copulation can take several hours. Sometimes females mate with other males later. The gestation period of the females lasts 11 to 14 weeks, and subsequently, between mid-July and the end of August, and sometimes even later, they usually give.

Slow worm. birth to between eight and twelve young (extreme values: 2 to 28). Slow worms are ovoviviparous; at birth, the 7 to 10 cm long young animals are in a very thin, transparent egg shell, which they pierce immediately afterwards. They initially weigh less than a gram and still have a remnant of the yolk. Juvenile slow worms have a contrasting color scheme and pattern. The top of the body is silvery-white to golden yellow, while the sides and underside are black.## Size and longevity.Adult slow worms grow to be about 50 cm (20") long, and are known for their exceptionally.

Slow worm. long lives; the slow worm may be the longest-living lizard, living about 30 years in the wild and up to at least 54 years in captivity (this record is held by a male slow worm that lived at the Copenhagen Zoo from 1892 until 1946, the age when first obtained is unknown). The female often has a stripe along the spine and dark sides, while the male may have blue spots dorsally. Juveniles of both sexes are gold with dark brown bellies and sides with a dark stripe along the spine.## Predators.Predators of "A. fragilis" include adders, badgers, birds of.

Slow worm. prey, crows, domestic cats, foxes, hedgehogs, pheasants and smooth snakes.## Ecology.These reptiles are mostly active during the night and do not bask in the sun like other reptiles, but choose to warm themselves underneath objects such as rocks which have in turn been warmed by the sun. They can often be found in long grass and other damp environments In a 2009 study of a Danish population, the diet of the slow-worm was found to include slugs, snails, earthworms, caterpillars and pill millipedes.## Protected status in the UK.In the United Kingdom, the slow worm has been granted protected status, alongside.

Slow worm. all other native British reptile species. The slow worm has been decreasing in numbers, and under the Wildlife and Countryside Act 1981, to intentionally kill, injure, sell, or advertise to sell them is illegal.## Ireland.The Slow Worm is assumed to not be native to Ireland, possibly arriving in the 1900's. Due to their secretive habits they are difficult to observe and have only been sighted in parts of County Clare, mainly in the Burren region.## Evolutionary history.Members of the genus "Anguis", to which the slow worm belongs, first appeared in Europe during the Mammal Paleogene zone 14, between 43.5 and.

Slow worm. 41.2 million years ago, corresponding to the Lutetian stage of the Eocene. Remains assigned to the "Anguis fragilis" species complex are known from the late Miocene onwards. Glass lizard.


Question: Which geographic area is this bird found?

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Laughing falcon. to 800 (g) compared to the males' 410 to 680 (g).Adults have a pale buff head, changeable between a more brownish and an almost white hue according to feather wear and individual variation. The broad black face mask stretches across the neck as a narrow collar, bordered with white. On the crown, the feather shafts are dark, producing a somewhat streaked effect. The upper wings and back are blackish brown. The uppertail coverts are whitish buff again, and the rectrices are barred black and whitish, ending in white. The underside is uniformly pale buff; there may be a bit of.

Laughing falcon. dark speckling on the thighs, however. The underside of the wing is pale rufous-buff, sometimes with some dark spotting on the underwing coverts. The tips of the primary remiges are barred with pale grey below, their bases are quite rufous. The iris is dark brown, the bill is black with a pale yellow cere; the feet are also pale yellow.Immature birds differ little from adults; they have lighter margins to the back feathers, producing a scalloped effect. The light parts of the plumage are almost white, paler than in adults; the unfeathered parts are also paler. Nestlings are covered in.

Laughing falcon. peculiarly dense down, reminiscent of a duckling's; they are generally brownish buff, darker above, and already show the blackish facial marks of the adults.With its big white (immature) or pale buff (adult) head having a dark brown mask from the eyes around to the nape, it is unmistakable. In flight it shows a rufous patch near each wingtip (formed by the basal parts of the primaries) and a shape more like an "Accipiter" hawk than most of its falcon relatives, with short, rounded wings and a long tail.## Voice.The namesake call is a long series of separate, rather human-like cries,.

Laughing falcon. and "guaycurú" (Guaraní).## Distribution and habitat.It is found from both coastal slopes of Mexico through Central and South America south to the Peruvian Amazon and Bolivian Amazon region, practically all of Brazil, and northern Argentina and Paraguay, at altitudes up to 1500 (m) (rarely to 2400 (m) in Colombia), though it is often absent from mountainous regions. It occupies varied habitats, usually including at least scattered trees; it prefers humid regions to arid ones and tends to avoid closed forest. It is generally not migratory, though in some areas it may make seasonal movements.## Behavior.The flight is slow, with quick,.

Laughing falcon. The laughing falcon pounces on its prey from flight, often with an audible thud, and then biting it just behind the head, sometimes removing the head in the process. It carries the food to a perch to eat. It may carry small snakes in its bill and swallow them tail-first; big snakes may be carried head-forward in its claws, as an osprey carries a fish, and then torn to pieces.## Breeding.The laughing falcon breeds in rock crevices, tree cavities, or occasionally in abandoned nests of a "Buteo" hawk or caracara; in general however it does not even gather nesting material.

Laughing falcon. in significant quantities. It lays one or two eggs according to some sources, but according to others always just one. The eggs have heavy dark brown markings on a brown or whitish or pale buff background. The young are thought to leave the nest eight weeks after hatching. The breeding season has been given as April and May, though it may well vary across the large range of this species.## Culture.The Ch'ol Maya of Chiapas, Mexico, believe that the laughing falcon can kill poisonous snakes because the birds are healers that can cure themselves if they are bitten. Tzotzil healers.


Question: What is the closest upper taxonomy of this insect?

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Dythemis velox. Dythemis velox, the swift setwing, is a species of skimmer in the dragonfly family Libellulidae. It is found in Central America and North America.The IUCN conservation status of "Dythemis velox" is "LC", least concern, with no immediate threat to the species' survival. The population is increasing. The IUCN status was reviewed in 2017.


Question: Where is this plant originally discovered?

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Rye. northern China.Production levels of rye have fallen since 1992 in most of the producing nations, . For instance, production of rye in Russia fell from 13.9 (e6t) in 1992 to 2.4 (e6t) in 2020. Corresponding figures for other countries are as follows: Polandfalling from 4.0 (Mt) in 1992 to 2.9 (Mt) in 2020; Belarusfalling from 3.1 (Mt) in 1992 to 1.1 (Mt) in 2020; Chinafalling from 1.7 (Mt) in 1992 to 0.5 (Mt) in 2020. However, production levels rose in Germany from 2.4 (Mt) in 1992 to 3.5 (Mt) in 2020.World trade of rye is low compared with other grains.


Question: Which place is this animal endemic to?

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Cane toad. The cane toad (Rhinella marina), also known as the giant neotropical toad or marine toad, is a large, terrestrial true toad native to South and mainland Central America, but which has been introduced to various islands throughout Oceania and the Caribbean, as well as Northern Australia. It is a member of the genus "Rhinella", which includes many true toad species found throughout Central and South America, but it was formerly assigned to the genus "Bufo".The cane toad is an old species. A fossil toad (specimen UCMP 41159) from the La Venta fauna of the late Miocene in Colombia is indistinguishable.

Cane toad. from modern cane toads from northern South America. It was discovered in a floodplain deposit, which suggests the "R. marina" habitat preferences have long been for open areas. The cane toad is a prolific breeder; females lay single-clump spawns with thousands of eggs. Its reproductive success is partly because of opportunistic feeding: it has a diet, unusual among anurans, of both dead and living matter. Adults average 10 – 15 (cm) in length; the largest recorded specimen had a snout-vent length of 24 (cm).The cane toad has poison glands, and the tadpoles are highly toxic to most animals if ingested.

Cane toad. "Dominican toad", "giant marine toad", and "South American cane toad". In Trinidadian English, they are commonly called "crapaud", the French word for toad.The genus "Rhinella" is considered to constitute a distinct genus of its own, thus changing the scientific name of the cane toad. In this case, the specific name "marinus" (masculine) changes to "marina" (feminine) to conform with the rules of gender agreement as set out by the International Code of Zoological Nomenclature, changing the binomial name from "Bufo marinus" to "Rhinella marina"; the binomial "Rhinella marinus" was subsequently introduced as a synonym through misspelling by Pramuk, Robertson, Sites,.

Cane toad. and Noonan (2008). Though controversial (with many traditional herpetologists still using "Bufo marinus") the binomial "Rhinella marina" is gaining in acceptance with such bodies as the IUCN, Encyclopaedia of Life, Amphibian Species of the World and increasing numbers of scientific publications adopting its usage.Since 2016, cane toad populations native to Mesoamerica and northwestern South America are sometimes considered to be a separate species, "Rhinella horribilis".In Australia, the adults may be confused with large native frogs from the genera "Limnodynastes", "Cyclorana", and "Mixophyes". These species can be distinguished from the cane toad by the absence of large parotoid glands behind their.

Cane toad. toads lose the toxicity that protected them as eggs and tadpoles, but have yet to fully develop the parotoid glands that produce bufotoxin. Only an estimated 0.5% of cane toads reach adulthood, in part because they lack this key defense - but also due to tadpole cannibalism. Although cannibalism does occur in the native population in South America, the rapid evolution occurring in the unnaturally large population in Australia has produced tadpoles 30x more likely to be "interested" in cannibalising their siblings, and 2.6x more likely to actually "do so". They have also evolved to shorten their tadpole phase in.

Cane toad. Saw-shelled Turtles have also been seen successfully and safely eating cane toads.## Distribution.The cane toad is native to the Americas, and its range stretches from the Rio Grande Valley in South Texas to the central Amazon and southeastern Peru, and some of the continental islands near Venezuela (such as Trinidad and Tobago). This area encompasses both tropical and semiarid environments. The density of the cane toad is significantly lower within its native distribution than in places where it has been introduced. In South America, the density was recorded to be 20 adults per 100 m (109 yd) of shoreline, 1.

Cane toad. in spite of the failure of the earlier introductions. On September 8, 2013, the cane toad was also discovered on the island of New Providence in the Bahamas.## The Philippines.The cane toad was first introduced deliberately into the Philippines in 1930 as a biological control agent of pests in sugarcane plantations, after the success of the experimental introductions into Puerto Rico. It subsequently became the most ubiquitous amphibian in the islands. It still retains the common name of "bakî" or "kamprag" in the Visayan languages, a corruption of 'American frog', referring to its origins. It is also commonly known as.

Cane toad. 17 months. The toads were sent to the other islands, and more than 100,000 toads were distributed by July 1934; eventually over 600,000 were transported.## Uses.Other than the use as a biological control for pests, the cane toad has been employed in a number of commercial and noncommercial applications. Traditionally, within the toad's natural range in South America, the Embera-Wounaan would "milk" the toads for their toxin, which was then employed as an arrow poison. The toxins may have been used as an entheogen by the Olmec people. The toad has been hunted as a food source in parts of.


Question: What is this lake named after?

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Pfäffikersee. Pfäffikersee (or "Lake Pfäffikon") is a lake in the canton of Zürich, Switzerland, near the town of Pfäffikon. It is 2.5 km long and 1.3 km wide at the middle. The lake was created in the last ice age when a moraine blocked off the ability for the lake to empty north towards Winterthur. There is also a hiking trail around the lake that people often bike and walk on, and the area is considered protected lands, among them the "Robenhauser Ried" and the prehistoric settlement Wetzikon–Robenhausen, discovered and researched by Jakob Messikommer (1828–1917), which became a serial site of.

Pfäffikersee. the UNESCO World Heritage Site "Prehistoric pile dwellings around the Alps". In Roman era, along "Pfäffikersee" there was a Roman road from the "vicus Centum Prata" (Kempraten) on Obersee–Lake Zürich via "Vitudurum" (Oberwinterthur) to "Tasgetium" (Eschenz) to the Rhine. To secure this important transport route, the Irgenhausen Castrum was built.List of lakes of SwitzerlandWaterlevels of Pfäffikersee at Pfäffikon.


Question: What is the length in kilometre is the island in the image?

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Confederation Bridge. The Confederation Bridge () is a box girder bridge carrying the Trans-Canada Highway across the Abegweit Passage of the Northumberland Strait, linking the province of Prince Edward Island with the province of New Brunswick on the mainland. Opened May 31, 1997, the 12.9 (km) bridge is Canada's longest bridge and the world's longest bridge over ice-covered water.Construction took place from October 1993 to May 1997 and cost C$1.3 billion. Before its official naming, Prince Edward Islanders often referred to the bridge as the "Fixed Link". It officially opened to traffic on May 31, 1997. In April 2022, the PEI legislature.


Question: What is the location of this building?

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Marble Church, Bodelwyddan. St Margaret's Church (nicknamed The Marble Church), Bodelwyddan, is a Decorated Gothic Style parish church in the lower Vale of Clwyd in Denbighshire, Wales and is visible for many miles because its spire rises to 202 feet. It lies just off the A55 trunk road.The church was erected by Lady Margaret Willoughby de Broke (daughter of Sir John Williams of nearby Bodelwyddan Castle) in memory of her husband, Henry Peyto-Verney, 16th Baron Willoughby de Broke. She laid the foundation stone on 24 July 1856 and the new church designed by John Gibson was consecrated by the Bishop of St Asaph.

Marble Church, Bodelwyddan. on 23 August 1860 after construction at a cost of £60,000. The new parish of Bodelwyddan was created on 3 August 1860, from the communities of Bodelwyddan, Faenol and Pengwern, which until that date had been part of the parish of St Asaph. When it was first built, it was nicknamed the 'Pearl of the Vale'.The church contains fourteen varieties of marble including pillars made of Belgian Red marble, a nave entrance is made from Anglesey marble and shafts of Languedoc marble on bases of Purbeck marble. It also contains elaborate woodwork, and in the tower can be found windows.

Marble Church, Bodelwyddan. of stained glass on the north and south sides, featuring Saint Margaret and Saint Kentigern. It is a popular tourist destination. The church was designated with Grade II* listed status in November 1962.Until the latter part of the 20th century the church, and in particular its high steeple, was very distinctive because it was so white. With the passage of time, pollution has resulted in the colour becoming more grey, and therefore more like other stone buildings.Local government reorganisation resulted in the church being in Flintshire until 1974, in Clwyd from 1974 until 1996, and since then in Denbighshire.## Churchyard.Immediately.

Marble Church, Bodelwyddan. to the west of the church is Kinmel Camp, which was a military camp located in the grounds of Kinmel Hall. The camp was used by Canadian troops during the First World War. The churchyard contains the graves of numerous victims of the Spanish flu pandemic of 1918–19 in the camp. On 4–5 March 1919 a riot occurred in the camp when the ship allocated to return the troops to Canada was diverted to carry food supplies to Russia. Five Canadian soldiers were killed in the disturbances, four of whom were buried in St Margaret's Churchyard, with the fifth, Gunner.

Marble Church, Bodelwyddan. John Frederick Hickman, being buried in Dorchester, New Brunswick. A common story is that they were executed for mutiny, but this has been denied by the Canadian Department of National Defence.In total there are 112 Commonwealth service personnel commemorated here from World War I. More than 80 of the graves are Canadian, and there are also Special Memorial headstones to 4 British soldiers who were buried at St Peter's Churchyard in Holywell. There are 2 war graves of British servicemen from World War II. Parish websiteArtwork at Marble Church, Bodelwyddan.


Question: What is this plant named after?

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Allamanda. Allamanda is a genus of flowering plants in the family Apocynaceae. They are native to the Americas, where they are distributed from Mexico to Argentina. Some species are familiar as ornamental plants cultivated for their large, colorful flowers. Most species produce yellow flowers; "A. blanchetii" bears pink flowers. The genus name "Allamanda" honors the Swiss botanist and physician Frédéric-Louis Allamand (1736–1809). It is the official flower of Kuching North City Hall.## Description.Plants of the genus are evergreen trees, shrubs, or vines. They contain a white latex. The leaves are opposite or arranged in whorls of up to 5. The blades.


Question: What is the facet of this object?

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Octagon. In geometry, an octagon (from the Greek ὀκτάγωνον "oktágōnon", "eight angles") is an eight-sided polygon or 8-gon.A "regular octagon" has Schläfli symbol {8} and can also be constructed as a quasiregular truncated square, t{4}, which alternates two types of edges. A truncated octagon, t{8} is a hexadecagon, {16}. A 3D analog of the octagon can be the rhombicuboctahedron with the triangular faces on it like the replaced edges, if one considers the octagon to be a truncated square.## Properties of the general octagon.The sum of all the internal angles of any octagon is 1080°. As with all polygons, the external.

Octagon. angles total 360°.If squares are constructed all internally or all externally on the sides of an octagon, then the midpoints of the segments connecting the centers of opposite squares form a quadrilateral that is both equidiagonal and orthodiagonal (that is, whose diagonals are equal in length and at right angles to each other).The midpoint octagon of a reference octagon has its eight vertices at the midpoints of the sides of the reference octagon. If squares are constructed all internally or all externally on the sides of the midpoint octagon, then the midpoints of the segments connecting the centers of opposite.

Octagon. squares themselves form the vertices of a square.## Regular octagon.A regular octagon is a closed figure with sides of the same length and internal angles of the same size. It has eight lines of reflective symmetry and rotational symmetry of order 8. A regular octagon is represented by the Schläfli symbol {8}.The internal angle at each vertex of a regular octagon is 135° (formula_1 radians). The central angle is 45° (formula_2 radians).## Area.The area of a regular octagon of side length "a" is given byformula_3In terms of the circumradius "R", the area isformula_4In terms of the apothem "r" (see also.

Octagon. inscribed figure), the area isformula_5These last two coefficients bracket the value of pi, the area of the unit circle.The area can also be expressed asformula_6where "S" is the span of the octagon, or the second-shortest diagonal; and "a" is the length of one of the sides, or bases. This is easily proven if one takes an octagon, draws a square around the outside (making sure that four of the eight sides overlap with the four sides of the square) and then takes the corner triangles (these are 45–45–90 triangles) and places them with right angles pointed inward, forming a square.

Octagon. The edges of this square are each the length of the base.Given the length of a side "a", the span "S" isformula_7The span, then, is equal to the "silver ratio" times the side, a.The area is then as above:formula_8Expressed in terms of the span, the area isformula_9Another simple formula for the area is formula_10More often the span "S" is known, and the length of the sides, "a", is to be determined, as when cutting a square piece of material into a regular octagon. From the above,formula_11The two end lengths "e" on each side (the leg lengths of the triangles (green.

Octagon. in the image) truncated from the square), as well as being formula_12 may be calculated asformula_13## Circumradius and inradius.The circumradius of the regular octagon in terms of the side length "a" isformula_14and the inradius isformula_15## Diagonals.The regular octagon, in terms of the side length "a", has three different types of diagonals:Short diagonal;Medium diagonal (also called span or height), which is twice the length of the inradius;Long diagonal, which is twice the length of the circumradius.The formula for each of them follows from the basic principles of geometry. Here are the formulas for their length:Short diagonal: formula_16 ;Medium diagonal: formula_17 ;.

Octagon. ("silver ratio" times a) Long diagonal: formula_18 .## Construction and elementary properties.A regular octagon at a given circumcircle may be constructed as follows:Draw a circle and a diameter AOE, where O is the center and A, E are points on the circumcircle.Draw another diameter GOC, perpendicular to AOE.(Note in passing that A,C,E,G are vertices of a square).Draw the bisectors of the right angles GOA and EOG, making two more diameters HOD and FOB.A,B,C,D,E,F,G,H are the vertices of the octagon.A regular octagon can be constructed using a straightedge and a compass, as 8 = 23, a power of two:The regular octagon.

Octagon. can be constructed with meccano bars. Twelve bars of size 4, three bars of size 5 and two bars of size 6 are required.Each side of a regular octagon subtends half a right angle at the centre of the circle which connects its vertices. Its area can thus be computed as the sum of 8 isosceles triangles, leading to the result:formula_19for an octagon of side "a".## Standard coordinates.The coordinates for the vertices of a regular octagon centered at the origin and with side length 2 are:(±1, ±(1+)) (±(1+), ±1).## Dissection.Coxeter states that every zonogon (a 2"m"-gon whose opposite sides are.

Octagon. parallel and of equal length) can be dissected into "m"("m"-1)/2 parallelograms.In particular this is true for regular polygons with evenly many sides, in which case the parallelograms are all rhombi. For the "regular octagon", "m"=4, and it can be divided into 6 rhombs, with one example shown below. This decomposition can be seen as 6 of 24 faces in a Petrie polygon projection plane of the tesseract. The list defines the number of solutions as 8, by the 8 orientations of this one dissection. These squares and rhombs are used in the Ammann–Beenker tilings.## Skew octagon.A skew octagon is a.

Octagon. skew polygon with 8 vertices and edges but not existing on the same plane. The interior of such an octagon is not generally defined. A "skew zig-zag octagon" has vertices alternating between two parallel planes.A regular skew octagon is vertex-transitive with equal edge lengths. In 3-dimensions it will be a zig-zag skew octagon and can be seen in the vertices and side edges of a square antiprism with the same D4d, [2+,8] symmetry, order 16.## Petrie polygons.The regular skew octagon is the Petrie polygon for these higher-dimensional regular and uniform polytopes, shown in these skew orthogonal projections of in A7,.

Octagon. B4, and D5 Coxeter planes.## Symmetry of octagon.The "regular octagon" has Dih8 symmetry, order 16. There are 3 dihedral subgroups: Dih4, Dih2, and Dih1, and 4 cyclic subgroups: Z8, Z4, Z2, and Z1, the last implying no symmetry.On the regular octagon, there are 11 distinct symmetries. John Conway labels full symmetry as r16. The dihedral symmetries are divided depending on whether they pass through vertices (d for diagonal) or edges (p for perpendiculars) Cyclic symmetries in the middle column are labeled as g for their central gyration orders. Full symmetry of the regular form is r16 and no symmetry is.

Octagon. labeled a1.The most common high symmetry octagons are p8, an isogonal octagon constructed by four mirrors can alternate long and short edges, and d8, an isotoxal octagon constructed with equal edge lengths, but vertices alternating two different internal angles. These two forms are duals of each other and have half the symmetry order of the regular octagon.Each subgroup symmetry allows one or more degrees of freedom for irregular forms. Only the g8 subgroup has no degrees of freedom but can seen as directed edges.## Uses of octagons.The octagonal shape is used as a design element in architecture. The Dome of.


Question: How many day is the egg incubation period of this bird?

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Varied bunting. The varied bunting ("Passerina versicolor") is a species of songbird in the cardinal family, Cardinalidae.The range of the varied bunting stretches from the southern parts of Arizona, New Mexico, and Texas in the United States south throughout Mexico as far as Oaxaca. Small disjunct populations occur in the state of Chiapas in Mexico and southeastern Guatemala. This stocky bird has a short tail and rounded bill. It is 11 - 14 (cm) long, has a wingspan of 21 (cm), and weighs 11 - 13 (g). Breeding males are purple-red with a bright red patch on the nape, which becomes browner.


Question: What is this building named after?

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Pieterskerk, Leiden. The Pieterskerk is a late-Gothic Dutch Protestant church in Leiden dedicated to Saint Peter. It is known today as the church of the Pilgrim Fathers, where the pastor John Robinson was buried. It is also the burial place of the scientist Willebrord Snellius.## History.In around 1100 the site held the county chapel of the counts of Holland, rebuilt in 1121. The present building took approximately 180 years to build, starting in 1390. Famous Leiden dignitaries are buried there, including the painter Jan Steen and the Leiden professor Herman Boerhaave. The beautiful stained-glass windows already took a terrible blow during the.


Question: Which place is this plant endemic to?

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Zantedeschia aethiopica. Zantedeschia aethiopica, commonly known as calla lily and arum lily, is a species of flowering plant in the family Araceae, native to southern Africa in Lesotho, South Africa, and Eswatini.## Description."Zantedeschia aethiopica" is a rhizomatous herbaceous perennial plant, evergreen where rainfall and temperatures are adequate, deciduous where there is a dry season. Its preferred habitat is in streams and ponds or on the banks. It grows to 0.6 – 1 (m) tall, with large clumps of broad, arrow shaped dark green leaves up to 45 (cm) long. The inflorescences are large and are produced in spring, summer and autumn, with.

Zantedeschia aethiopica. a pure white spathe up to 25 (cm) and a yellow spadix up to 90 (mm) long. The spadix produces a faint, sweet fragrance."Zantedeschia aethiopica" contains calcium oxalate, and ingestion of the raw plant may cause a severe burning sensation and swelling of lips, tongue, and throat; stomach pain and diarrhea may occur.## Distribution and habitat."Z. aethiopica" is native to southern Africa, specifically Lesotho, Mozambique, South Africa, and Eswatini. It has naturalised in Kenya, Madeira, Azores, Malawi, New Zealand, Tanzania, Zambia, coastal California and Australia, particularly in Western Australia, where it has been classified as a toxic weed and pest.


Question: What is the closest upper taxonomy of this bird?

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Gannet. Gannets are seabirds comprising the genus Morus in the family Sulidae, closely related to boobies.Gannets are large white birds with yellowish heads; black-tipped wings; and long bills. Northern gannets are the largest seabirds in the North Atlantic, having a wingspan of up to 2 (m). The other two species occur in the temperate seas around southern Africa, southern Australia, and New Zealand.## Etymology."Gannet" is derived from Old English "ganot" meaning "strong or masculine", ultimately from the same Old Germanic root as "gander".## Taxonomy."Morus" is derived from Ancient Greek "moros" "stupid" or "foolish" due to lack of fear shown by breeding.

Gannet. gannets and boobies, allowing them to be easily killed.## Behaviour.## Hunting.Gannets hunt fish by diving into the sea from a height of 30 (m) and pursuing their prey underwater, and have a number of adaptations: They have no external nostrils; they are located inside the mouth, instead. They have air sacs in the face and chest under the skin, which act like bubble wrap, cushioning the impact with the water. The position of their eyes is far enough forward on the face for binocular vision, allowing them to judge distances accurately.Gannets can achieve speeds of 100 (km/h) as they strike.

Gannet. the water, enabling them to catch fish at a much greater depth than most airborne birds.The gannet's supposed capacity for eating large quantities of fish has led to "gannet" becoming a description of somebody with a voracious appetite.## Mating and nesting.Gannets are colonial breeders on islands and coasts, normally laying one chalky-blue egg. They lack brood patches and use their webbed feet to warm the eggs. They reach maturity around 5 years of age. First-year birds are completely black, and subsequent subadult plumages show increasing amounts of white.## Northern gannets.The most important nesting ground for northern gannets is the United.


Question: In which year did this facility officially open?

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Battersea Power Station. steam turbine turbo generators, was produced by Metropolitan-Vickers in Trafford Park, Manchester. The building of the steel frame began in October 1930. Once completed, the construction of the brick cladding began, in March 1931. Until the construction of the B Station, the eastern wall of the boiler house was clad in corrugated metal sheeting as a temporary enclosure. The A Station first generated electricity in 1933, but was not completed until 1935. The total cost of its construction was £2,141,550. Between construction beginning in 1929 and 1933, there were six fatal and 201 non-fatal accidents on the site.After the end.


Question: What is the thermal conductivity of this material (watt per metre kelvin)?

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Water. in the liquid or solid state can form up to four hydrogen bonds with neighboring molecules. Hydrogen bonds are about ten times as strong as the Van der Waals force that attracts molecules to each other in most liquids. This is the reason why the melting and boiling points of water are much higher than those of other analogous compounds like hydrogen sulfide. They also explain its exceptionally high specific heat capacity (about 4.2 J/g/K), heat of fusion (about 333 J/g), heat of vaporization (), and thermal conductivity (between 0.561 and 0.679 W/m/K). These properties make water more effective at.


Question: Where do you usually find this animal?

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Wolf. habitat.Wolves occur across Eurasia and North America. However, deliberate human persecution because of livestock predation and fear of attacks on humans has reduced the wolf's range to about one-third of its historic range; the wolf is now extirpated (locally extinct) from much of its range in Western Europe, the United States and Mexico, and completely in Ireland, the United Kingdom, and Japan. In modern times, the wolf occurs mostly in wilderness and remote areas. The wolf can be found between sea level and 3000 (m). Wolves live in forests, inland wetlands, shrublands, grasslands (including Arctic tundra), pastures, deserts, and rocky.

Wolf. are nocturnal predators. During the winter, a pack will commence hunting in the twilight of early evening and will hunt all night, traveling tens of kilometres. Sometimes hunting large prey occurs during the day. During the summer, wolves generally tend to hunt individually, ambushing their prey and rarely giving pursuit.When hunting large gregarious prey, wolves will try to isolate an individual from its group. If successful, a wolf pack can bring down game that will feed it for days, but one error in judgement can lead to serious injury or death. Most large prey have developed defensive adaptations and behaviours.


Question: What is the length of the wingspan in metre of this bird?

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Wandering albatross. Good Hope. "Diomedea" refers to Diomedes whose companions turned to birds, and "exulans" or "exsul" are Latin for "exile" or "wanderer" referring to its extensive flights. The type locality has been restricted to South Georgia.Some experts considered there to be four subspecies of "D. exulans", which they elevated to species status, and use the term "wandering albatross" to refer to a species complex that includes the proposed species "D. antipodensis", "D. dabbenena", "D. exulans", and "D. gibsoni".## Description.The wandering albatross has the longest wingspan of any living bird, typically ranging from 2.51 to 3.5 (m), with a mean span of.

Wandering albatross. 3.1 (m) in the Bird Island, South Georgia colony and an average of exactly 3 (m) in 123 birds measured off the coast of Malabar, New South Wales. On the Crozet Islands, adults averaged 3.05 (m) in wingspan. The longest-winged examples verified have been about 3.7 (m). Even larger examples have been claimed, with two giants reportedly measuring 4.22 (m) and 5.3 (m) but these reports remain unverified. As a result of its wingspan, it is capable of remaining in the air without flapping its wings for several hours at a time (travelling 22 m for every metre of drop).

Wandering albatross. The length of the body is about 107 to 135 (cm) with females being slightly smaller than males. Adults can weigh from 5.9 to 12.7 (kg), although most will weigh 6.35 to 11.91 (kg). On Macquarie Island, three males averaged 8.4 (kg) and three females averaged 6.2 (kg). In the Crozet Islands, males averaged 9.44 (kg) while females averaged 7.84 (kg). However, 10 unsexed adults from the Crozets averaged 9.6 (kg). On South Georgia, 52 males were found to average 9.11 (kg) while 53 females were found to average 7.27 (kg). Immature birds have been recorded weighing as much as.

Wandering albatross. until 11 to 15 years. About 31.5% of fledglings survive. ## Relationship with humans.Sailors used to capture the birds for their long wing bones, from which they made tobacco-pipe stems. The early explorers of the great Southern Sea cheered themselves with the companionship of the albatross in their dreary solitudes; and the evil fate of him who shot with his cross-bow the "bird of good omen" is familiar to readers of Coleridge's "The Rime of the Ancient Mariner". The metaphor of "an albatross around his neck" also comes from the poem and indicates an unwanted burden causing anxiety or hindrance.

Wandering albatross. as vulnerable status. Adult mortality is 5% to 7.8% per year as of 2003. It has an occurrence range of 64700000 (km2), although its breeding range is only 1900 (km2).In 2007, there were an estimated 25,500 adult birds, broken down to 1,553 pairs on South Georgia Island, 1,850 pairs on Prince Edward Island, 1,600 on Marion Island, 2,000 on Crozet Islands, 1,100 on the Kerguelen Islands, and 12 on Macquarie Island for a total of 8,114 breeding pairs.The South Georgia population is shrinking at 1.8% per year. The levels of birds at Prince Edward and the Crozet Islands seem to.

Wandering albatross. which contain the heaviest living flying birds "Pelagornis sandersi", the largest flying bird ever to liveLindsey, T.R. 1986. "The Seabirds of Australia". Angus and Robertson, and the National Photographic Index of Australian Wildlife Sydney.Marchant, S. and Higgins, P.J. (eds) 1993. "Handbook of Australian New Zealand And Antarctic Birds" Vol. 2: (Raptors To Lapwings). Oxford University Press, Melbourne.Parmelee, D.F. 1980. "Bird Island in Antarctic Waters". University of Minnesota Press, Minneapolis.Species factsheet – BirdLife InternationalFact file – ARKiveVideo, photos and sounds – Internet Bird CollectionHolotype photos – Collections Online, Museum of New Zealand Te Papa TongarewaDo albatrosses have personalities? – Video, Te.


Question: What equipment or engine is used by this vehicle to provide power?

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Nissan Juke. "HR16DE" petrol, 1.5-litre "K9K" diesel and 1.6-litre "MR16DDT" petrol engines: Visia, Acenta (also available with Sport and Premium packs), Tekna, Nismo and Nismo RS. In 2012, Nissan replaced the limited edition Juke Kuru with the Juke Shiro model. The Shiro was a limited edition Juke with white accents throughout the interior including white stitching on the leather seats, gear shifter and steering wheel as well as several other aesthetic options.The car was launched in the UK on 24 September 2010.## New Zealand.Two trim levels: ST and Ti, are available. Both are front-wheel drive and are powered by the HR16DE engine.


Question: Where is this animal native to?

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Pseudacris sierra. The Sierran chorus frog or Sierran treefrog ("Pseudacris sierra") has a range from the West Coast of the United States from Central California inland through Idaho. They live from sea level to more than 10,000 feet in many types of habitats, reproducing in aquatic settings. They occur in shades of greens or browns and can change colors over periods of hours and weeks.## Taxonomy.The naming of this frog has a very confusing history. These frogs have long been known as Pacific chorus frogs "Pseudacris regilla". Then, in 2006, Recuero et al. split that taxonomic concept into three species. Recuero et.


Question: What is the weight of a male of this bird in kilogram?

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Wandering albatross. The length of the body is about 107 to 135 (cm) with females being slightly smaller than males. Adults can weigh from 5.9 to 12.7 (kg), although most will weigh 6.35 to 11.91 (kg). On Macquarie Island, three males averaged 8.4 (kg) and three females averaged 6.2 (kg). In the Crozet Islands, males averaged 9.44 (kg) while females averaged 7.84 (kg). However, 10 unsexed adults from the Crozets averaged 9.6 (kg). On South Georgia, 52 males were found to average 9.11 (kg) while 53 females were found to average 7.27 (kg). Immature birds have been recorded weighing as much as.


Question: What is this place named after?

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Marble Arch. design is based on that of the Arch of Constantine in Rome and the Arc de Triomphe du Carrousel in Paris. The triumphal arch is faced with Carrara marble with embellishments of marble extracted from quarries near Seravezza in Tuscany, Italy.John Flaxman was chosen to make the commemorative sculpture. After his death in 1826, the commission was divided between Sir Richard Westmacott, Edward Hodges Baily and J. C. F. Rossi. In 1829, a bronze equestrian statue of George IV was commissioned from Sir Francis Chantrey, with the intention of placing it on top of the arch.Construction began in 1827, but.


Question: What is the height of this animal in metre?

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Elephant. in size led to the development and elongation of the mobile trunk to provide reach. The number of premolars, incisors and canines decreased.The cheek teeth (molars and premolars) of proboscideans became larger and more specialized, especially after elephants started to switch from C3-plants to C4-grasses, which caused their teeth to undergo a three-fold increase in teeth height as well as substantial multiplication of lamellae after about five million years ago. Only in the last million years or so did they return to a diet mainly consisting of C3 trees and shrubs. The upper second incisors grew into tusks, which varied.

Elephant. develop gigantism in these conditions. Dwarf elephants are known to have lived in Indonesia, the Channel Islands of California, and several islands of the Mediterranean.## Anatomy.## Size.Elephants are the largest living terrestrial animals. African bush elephants are the largest species, with males being 304 - 336 (cm) tall at the shoulder with a body mass of 5.2 - 6.9 (MT) and females standing 247 - 273 (cm) tall at the shoulder with a body mass of 2.6 - 3.5 (MT). Male Asian elephants are usually about 261 - 289 (cm) tall at the shoulder and 3.5 - 4.6 (MT) whereas.

Elephant. of cracking a peanut shell without breaking the seed. With its trunk, an elephant can reach items at heights of up to 7 (m) and dig for water under mud or sand. Individuals may show lateral preference when grasping with their trunks: some prefer to twist them to the left, others to the right. Elephants are capable of dilating their nostrils at a radius of nearly 30%, increasing the nasal volume by 64%, and can inhale at over 150 (m/s) which is around 30 times the speed of a human sneeze. Elephants can suck up food and water both to.

Elephant. teeth falls out at four to six years old. The third set falls out at 9–15 years of age and set four lasts until 18–28 years of age. The fifth set of teeth falls out at the early 40s. The sixth (and usually final) set must last the elephant the rest of its life. Elephant teeth have loop-shaped dental ridges, which are thicker and more diamond-shaped in African elephants.## Tusks.The tusks of an elephant are modified second incisors in the upper jaw. They replace deciduous milk teeth at 6–12 months of age and grow continuously at about 17 (cm) a.

Elephant. well into a gallop, even accounting for leg length. Spring-like kinetics could explain the difference between the motion of elephants and other animals. During locomotion, the cushion pads expand and contract, and reduce both the pain and noise that would come from a very heavy animal moving. Elephants are capable swimmers. They have been recorded swimming for up to six hours without touching the bottom, and have swum as far as 48 (km) at a stretch and at speeds of up to 2.1 (km/h).## Organs.The brain of an elephant weighs 4.5 – 5.5 (kg) compared to 1.6 (kg) for a.

Elephant. human brain. It is the largest of all terrestrial mammals. While the elephant brain is larger overall, it is proportionally smaller than the human brain when compared to their size. At birth, an elephant's brain already weighs 30–40% of its adult weight. The cerebrum and cerebellum are well developed, and the temporal lobes are so large that they bulge out laterally. Their temporal lobes are proportionally larger than in other animals, including humans. The throat of an elephant appears to contain a pouch where it can store water for later use. The larynx of the elephant is the largest known.

Elephant. among mammals. The vocal folds are long and are attached close to the epiglottis base. When comparing an elephant's vocal folds to those of a human, an elephant's are longer, thicker, and have a larger cross-sectional area. In addition, they are tilted at 45 degrees and positioned more anteriorly than a human's vocal folds.The heart of an elephant weighs 12 – 21 (kg). It has a double-pointed apex, an unusual trait among mammals. In addition, the ventricles separate near the top of the heart, a trait they share with sirenians. When standing, the elephant's heart beats approximately 30 times per.

Elephant. fully erect and has a Y-shaped orifice. The female has a well-developed clitoris at up to 40 (cm). The vulva is located between the hind legs instead of near the tail as in most mammals. Determining pregnancy status can be difficult due to the animal's large abdominal cavity. The female's mammary glands occupy the space between the front legs, which puts the suckling calf within reach of the female's trunk. Elephants have a unique organ, the temporal gland, located in both sides of the head. This organ is associated with sexual behaviour, and males secrete a fluid from it when.

Elephant. and will eat leaves, twigs, fruit, bark, grass and roots. They are born with sterile intestines and require bacteria obtained from their mother's feces to digest vegetation. African elephants are mostly browsers while Asian elephants are mainly grazers. They can consume as much as 150 (kg) of food and 40 (L) of water in a day. Elephants tend to stay near water sources. Major feeding bouts take place in the morning, afternoon and night. At midday, elephants rest under trees and may doze off while standing. Sleeping occurs at night while the animal is lying down. Elephants average 3–4 hours.

Elephant. he matures, a male spends more time at the edge of his group and associates with outside males or even other families. At Amboseli, young males spend over 80% of their time away from their families when they are 14–15. When males permanently leave, they either live alone or with other males. The former is typical of bulls in dense forests. Asian males are usually solitary, but occasionally form groups of two or more individuals; the largest consisted of seven bulls. Larger bull groups consisting of over 10 members occur only among African bush elephants, the largest of which numbered.

Elephant. up to 144 individuals. Bulls only return to the herd to breed or to socialize, they do not provide prenatal care to their offspring but rather play a fatherly role to younger bulls to show dominance.Male elephants can be quite sociable when not competing for dominance or mates, and will form long-term relationships. A dominance hierarchy exists among males, whether they range socially or solitarily. Dominance depends on the age, size and sexual condition, and when in groups, males follow the lead of the dominant bull. Young bulls may seek out the company and leadership of older, more experienced males,.

Elephant. whose presence appears to control their aggression and prevent them from exhibiting "deviant" behaviour. Adult males and females come together for reproduction. Bulls associate with family groups if an oestrous cow is present.## Sexual behaviour.## Musth.Adult males enter a state of increased testosterone known as musth. In a population in southern India, males first enter musth at the age of 15, but it is not very intense until they are older than 25. At Amboseli, bulls under 24 do not go into musth, while half of those aged 25–35 and all those over 35 do. Young bulls appear to enter.

Elephant. season. A cow in oestrus releases chemical signals (pheromones) in her urine and vaginal secretions to signal her readiness to mate. A bull will follow a potential mate and assess her condition with the flehmen response, which requires the male to collect a chemical sample with his trunk and bring it to the vomeronasal organ. The oestrous cycle of a cow lasts 14–16 weeks with a 4–6-week follicular phase and an 8- to 10-week luteal phase. While most mammals have one surge of luteinizing hormone during the follicular phase, elephants have two. The first (or anovulatory) surge, could signal to.

Elephant. males that the female is in oestrus by changing her scent, but ovulation does not occur until the second (or ovulatory) surge. Fertility rates in cows decline around 45–50 years of age.Bulls engage in a behaviour known as mate-guarding, where they follow oestrous females and defend them from other males. Most mate-guarding is done by musth males, and females actively seek to be guarded by them, particularly older ones. Thus these bulls have more reproductive success. Musth appears to signal to females the condition of the male, as weak or injured males do not have normal musths. For young females,.

Elephant. the approach of an older bull can be intimidating, so her relatives stay nearby to provide support and reassurance. During copulation, the male lays his trunk over the female's back. The penis is very mobile, being able to move independently of the pelvis. Before mounting, it curves forward and upward. Copulation lasts about 45 seconds and does not involve pelvic thrusting or ejaculatory pause. Elephant sperm must swim close to 2 (m) to reach the egg. By comparison, human sperm has to swim around only 76.2 (mm).Homosexual behaviour is frequent in both sexes. As in heterosexual interactions, this involves mounting.

Elephant. to groom, drink, and feed itself are fully developed. It still needs its mother for nutrition and protection from predators for at least another year. Suckling bouts tend to last 2–4 min/hr for a calf younger than a year and it continues to suckle until it reaches three years of age or older. Suckling after two years may serve to maintain growth rate, body condition and reproductive ability.Play behaviour in calves differs between the sexes; females run or chase each other while males play-fight. The former are sexually mature by the age of nine years while the latter become mature.

Elephant. around 14–15 years. Adulthood starts at about 18 years of age in both sexes. Elephants have long lifespans, reaching 60–70 years of age. Lin Wang, a captive male Asian elephant, lived for 86 years.## Communication.Touching is an important form of communication among elephants. Individuals greet each other by stroking or wrapping their trunks; the latter also occurs during mild competition. Older elephants use trunk-slaps, kicks, and shoves to discipline younger ones. Individuals of any age and sex will touch each other's mouths, temporal glands, and genitals, particularly during meetings or when excited. This allows individuals to pick up chemical cues.

Elephant. vegetation. They are usually bluffing when performing these actions. Excited elephants may raise their trunks. Submissive ones will lower their heads and trunks, as well as flatten their ears against their necks, while those that accept a challenge will position their ears in a V shape.Elephants produce several vocalisations, usually through the larynx, though some may be modified by the trunk. These include trumpets, roars, barks, snorts, growls and rumbles which may be produced for either short or long range communication. Elephants may produce infrasonic rumbles. For Asian elephants, these calls have a frequency of 14–24 Hz, with sound pressure.

Elephant. in Central Africa, 110,000 in eastern Africa, 204,000 in southern Africa, and 19,000 in western Africa. About 214,000 elephants were estimated to live in the rainforests, fewer than had previously been thought. From 1977 to 1989, elephant populations declined by 74% in East Africa. After 1987, losses in elephant numbers accelerated, and savannah populations from Cameroon to Somalia experienced a decline of 80%. African forest elephants had a total loss of 43%. Population trends in southern Africa were mixed, with anecdotal reports of losses in Zambia, Mozambique and Angola while populations grew in Botswana and Zimbabwe and were stable in.

Elephant. South Africa. Conversely, studies in 2005 and 2007 found populations in eastern and southern Africa were increasing by an average annual rate of 4.0%. The IUCN estimated that total population in Africa is estimated at around to 415,000 individuals for both species combined as of 2016.African elephants receive at least some legal protection in every country where they are found, but 70% of their range exists outside protected areas. Successful conservation efforts in certain areas have led to high population densities. As of 2008, local numbers were controlled by contraception or translocation. Large-scale cullings ceased in 1988 when Zimbabwe abandoned.

Elephant. be around 40,000–50,000, although this may be a loose estimate. Around 60% of the population is in India. Although Asian elephants are declining in numbers overall, particularly in Southeast Asia, the population in the Western Ghats appears to be increasing.## Threats.The poaching of elephants for their ivory, meat and hides has been one of the major threats to their existence. Historically, numerous cultures made ornaments and other works of art from elephant ivory, and its use rivalled that of gold. The ivory trade contributed to the African elephant population decline in the late 20th century. This prompted international bans on.

Elephant. riding on them or to pin the soldier to the ground and impale him.One of the earliest references to war elephants is in the Indian epic "Mahabharata" (written in the 4th century BC, but said to describe events between the 11th and 8th centuries BC). They were not used as much as horse-drawn chariots by either the Pandavas or Kauravas. During the Magadha Kingdom (which began in the 6th century BC), elephants began to achieve greater cultural importance than horses, and later Indian kingdoms used war elephants extensively; 3,000 of them were used in the Nandas (5th and 4th centuries.

Elephant. BC) army while 9,000 may have been used in the Mauryan army (between the 4th and 2nd centuries BC). The "Arthashastra" (written around 300 BC) advised the Mauryan government to reserve some forests for wild elephants for use in the army, and to execute anyone who killed them. From South Asia, the use of elephants in warfare spread west to Persia and east to Southeast Asia. The Persians used them during the Achaemenid Empire (between the 6th and 4th centuries BC) while Southeast Asian states first used war elephants possibly as early as the 5th century BC and continued to.

Elephant. an overabundance of the animals.Keeping elephants in zoos has met with some controversy. Proponents of zoos argue that they offer researchers easy access to the animals and provide money and expertise for preserving their natural habitats, as well as safekeeping for the species. Critics claim that the animals in zoos are under physical and mental stress. Elephants have been recorded displaying stereotypical behaviours in the form of swaying back and forth, trunk swaying, or route tracing. This has been observed in 54% of individuals in UK zoos. Elephants in European zoos appear to have shorter lifespans than their wild counterparts.

Elephant. after cullings in the 1970s and 1980s. Because of the timing, these attacks have been interpreted as vindictive. In parts of India, male elephants regularly enter villages at night, destroying homes and killing people. Elephants killed around 300 people between 2000 and 2004 in Jharkhand while in Assam, 239 people were reportedly killed between 2001 and 2006.Local people have reported their belief that some elephants were drunk during their attacks, although officials have disputed this explanation. Purportedly drunk elephants attacked an Indian village a second time in December 2002, killing six people, which led to the killing of about 200.

Elephant. no similar animals familiar to Western audiences. The use of the elephant as a symbol of the U.S. Republican Party began with an 1874 cartoon by Thomas Nast. As characters, elephants are most common in children's stories, in which they are generally cast as models of exemplary behaviour. They are typically surrogates for humans with ideal human values. Many stories tell of isolated young elephants returning to a close-knit community, such as "The Elephant's Child" from Rudyard Kipling's "Just So Stories", Disney's "Dumbo," and Kathryn and Byron Jackson's "The Saggy Baggy Elephant". Other elephant heroes given human qualities include Jean.


Question: What country does this building belong to?

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Prohodna. Prohodna () is a karst cave in north central Bulgaria, located in the Iskar Gorge near the village of Karlukovo in Lukovit Municipality, Lovech Province. The cave is known for the two eye-like holes in its ceiling, known as God's eyes.Prohodna is the best known attraction in the Karlukovo Gorge (part of the Geological Park Iskar-Panega), one of the largest karst regions in Bulgaria and a popular location for speleology. Formed during the Quaternary, Prohodna is 262 (m) long, which makes it the longest cave passage in Bulgaria. The cave has two entrances which lie opposite one another, known respectively.

Prohodna. as the Small Entrance and the Big Entrance. The former is 35 (m) high and the latter reaches 42.5 or 45 (m) in height. The cave owes its name, which literally means "Thoroughfare Cave" or "Passage Cave", to this feature. The size of the Big Entrance of Prohodna makes it suitable for bungee jumping, and it is among the popular spots in Bulgaria for that activity. There are traces of prehistoric habitation in the Prohodna cave, which testify that humans lived in the cave during the Neolithic and Chalcolithic.Prohodna is most notable for the two equal-sized holes in the ceiling.

Prohodna. of its middle chamber. The holes, formed through erosion, let in light into the cave. The formation is popularly known as "God's eyes". The phenomenon was featured in the 1988 Bulgarian film "Time of Violence"; in the scene, a priest named Aligorko prays below the Eyes.The cave lies 2 (km) from Karlukovo, near the Karlukovo–Lukovit road. It is also accessible from Rumyantsevo, and there is a parking lot near the Small Entrance. Near Prohodna is the much longer cave Temnata Dupka, and a pathway from the Big Entrance of Prohodna leads to the Petar Tranteev National Caving House, one of.

Prohodna. the 100 Tourist Sites of Bulgaria. The eyes of God, Prohodna Caves "Random-Times.com.


Question: Which city or region does this village locate in?

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Cranny. Cranny () is a small village in County Clare, Ireland.## Location.Cranny lies on the banks of the Cloon River, which flows into the estuary of the River Shannon at Clonderlaw Bay.## Facilities.There is a local Gaelic Athletic Association club, Coolmeen GAA, founded in 1887 three years after the association came together. Coolmeen GAA succeeded in the Clare Senior Football Championship in 1919 and 1921, in the Clare Intermediate Football Championship in 1959, 1966 and 1967 and in the Clare Junior A Football Championship in 1958, 1964, 1983 and 1999. The parish also has a national school. The Cranny N.S. is.