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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.


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Aysgarth Falls. Aysgarth Falls are a triple flight of waterfalls, surrounded by woodland and farmland, carved out by the River Ure over an almost 1 (mi) stretch on its descent to mid-Wensleydale in the Yorkshire Dales of England, near the village of Aysgarth. The falls are quite spectacular after heavy rainfall as thousands of gallons of water cascade over the series of broad limestone steps, which are divided into three stages: Upper Force, Middle Force and Lower Force.The falls are an SSSI.Aysgarth Falls have attracted visitors for more than 200 years, including John Ruskin, J. M. W. Turner and William Wordsworth visited,.

Aysgarth Falls. all enthusing about the falls' outstanding beauty. All three falls were featured in the film "".The Falls are situated in the Yorkshire Dales National Park. There is a visitors' centre with an exhibition, information, items for sale, a café, toilets and a pay-and-display car park.There are public footpaths through the wooded valley, offering views of the river and falls. Wild flowers appear in the spring and summer, for example snowdrops in January and February, primroses in April and bluebells in May, and birds, squirrels and deer may also be seen. Occasionally salmon can be seen leaping up the falls in.


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Thermostat. a mercury thermostat to regulate the temperature of a chicken incubator. This is one of the first recorded feedback-controlled devices.Modern thermostat control was developed in the 1830s by Andrew Ure (1778–1857), a Scottish chemist, who invented the bi-metallic thermostat. The textile mills of the time needed a constant and steady temperature to operate optimally, so to achieve this Ure designed the bimetallic thermostat, which would bend as one of the metals expanded in response to the increased temperature and cut off the energy supply.Warren S. Johnson (1847–1911) of Wisconsin patented a bi-metal room thermostat in 1883, and two years later.

Thermostat. a heating or cooling system via a series of air-filled control tubes. This "control air" system responds to the pressure changes (due to temperature) in the control tube to activate heating or cooling when required. The control air typically is maintained on "mains" at 15-18 psi (although usually operable up to 20 psi). Pneumatic thermostats typically provide output/ branch/ post-restrictor (for single-pipe operation) pressures of 3-15 psi which is piped to the end device (valve/ damper actuator/ pneumatic-electric switch, etc.).The pneumatic thermostat was invented by Warren Johnson in 1895 soon after he invented the electric thermostat. In 2009, Harry Sim.


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Maryland State Fair. Maryland. Despite its success, the Lutherville Fair was short-lived because an extension of the Northern Central Railroad (the former Baltimore and Susquehanna Railroad) was being constructed through the middle of the fairgrounds.Their success in Lutherville, however, gave the operators resolve to establish an annual fair, and in December 1878, they incorporated as the Agricultural Society of Baltimore County. The corporation leased a 37 (acre) plot of land on the old Baltimore and York Turnpike on what was then known as "the Timonium Estate." The first Fair at its new home was held September 9–12, 1879. The Northern Central Railroad, the.

Maryland State Fair. diesel buses brought visitors to the Fair in addition to the thousands of cars parked on acres of lots around the grounds for that last week of summer.Late in the century, The Agricultural Society of Baltimore County faced stiff competition from the nearby Pimlico Fair, also referred to as "the State Fair". Ultimately, the two groups held joint fairs in 1894 and 1897, and in 1906, merged to form one corporation - "the Maryland State Fair and Agricultural Society of Baltimore County, Maryland". Their annual Fair then became known as "The Maryland State Fair".The early years at the Fair saw.

Maryland State Fair. Fair was interrupted because of the war effort in World War II. The fairgrounds were leased to the U.S. Army for a storage depot and a vehicle repair center. After a three-year suspension, the Fair reopened its gates in 1946.In 1999, the Fair added another day, making the Fair now an 11-day event.In 2020, the fair was restricted to private livestock and other virtual shows due to the COVID-19 pandemic.## Timonium Race Track.In the 1950s, growth in population and development in increasingly suburban Baltimore County flourished, and certain business interests wanted to purchase the fairgrounds site for industrial development. The.


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Bronbeek. Bronbeek is a former Royal palace in Arnhem, Netherlands. It is now a museum and a home for elderly soldiers.Bronbeek was built early in the 19th century. In 1845 the Dutch King William III bought it. He donated it to the Dutch state in 1859. William wanted it to be a home for disabled KNIL soldiers. The inhabitants took their collections of 'souvenirs' with them. This turned into a museum about the Dutch East Indies.In 2004, 50 former soldiers had their home in Bronbeek. Museum site Brobee a striped little green furry monster on the series "Yo Gabba Gabba!


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

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Penstemon newberryi. Penstemon newberryi is a species of penstemon known by the common name mountain pride or Newberry's penstemon. It is native to the mountains of northern California, Oregon, and Nevada, where it grows in rocky habitat, often at high elevation, such as talus. It is a bushy, mat-forming subshrub growing up to 30 centimeters tall. The leaves are mostly basal on the plant, oblong or oval and toothed, measuring 1 to 4 centimeters in length, with a few smaller pairs along the stem. The glandular inflorescence bears showy magenta flowers 2 to over 3 centimeters in length. The flower is generally.

Penstemon newberryi. tubular or funnel-shaped and has a coating of short to long and curly hairs in the mouth and on the staminode."Penstemon newberryi" is included in "Penstemon" subgenus "Dasanthera", along with "P. barrettiae", "P. cardwellii", "P. davidsonii", "P. ellipticus", "P. fruticosus", "P. lyallii", "P. montanus", and "P. rupicola".In cultivation in the UK it has received the Royal Horticultural Society's Award of Garden Merit. It tolerates a wide range of positions, but requires full sun.This was John Muir's favorite flower.The Latin specific epithet "newberryi" honors the American geologist and botanist John Strong Newberry (1822-1892).Jepson Manual TreatmentPhoto gallery.


Question: What is the genre of this building?

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Bedside. Bedside is a 1934 American pre-Code drama film starring Warren William, Jean Muir and Allen Jenkins. A man passes himself off as a doctor. Warren William as Bob Brown Jean Muir as Caroline Grant Allen Jenkins as Sam Sparks David Landau as Smith Katharine Sergava (Kathryn Sergava) as Mimi Maritza Henry O'Neill as Dr. William Chester Donald Meek as Dr. George Wiley Renee Whitney as Mme. Varsova Walter Walker as Dr. Michaels Marjorie Lytell as Patient with Sprained Ankle Frederick Burton as Hospital Superintendent Philip Faversham as Intern Attending Caroline (as Phillip Faversham) Louise Beavers as Pansy Earle Foxe as.


Question: What is the basionym of this plant?

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Calystegia sepium. Calystegia sepium (hedge bindweed, Rutland beauty, bugle vine, heavenly trumpets, bellbind, granny-pop-out-of-bed and many others) is a species of flowering plant in the family Convolvulaceae. It has a subcosmopolitan distribution throughout temperate regions of the North and South hemispheres.## Description.It is an herbaceous perennial that twines around other plants, in a counter-clockwise direction, to a height of up to 2 - 4 (m), rarely 5 (m). The pale matte green leaves are arranged spirally, simple, pointed at the tip and are arrowhead shaped, 5–10 (cm) long and 3–7 (cm) broad.The flowers are white, or pale pink with five darker stripes,.

Calystegia sepium. in hedges, fields, borders, roadsides and open woods.Hedge bindweed is toxic, containing calystegine alkaloids.## Identification.There are several species of "Calystegia" which and occur in similar habitats and can be difficult to distinguish, especially when not in flower. It is common practice in Britain to treat "C. sepium", "C. silvatica" and "C. pulchra" as an aggregate, usually recorded as ""C. sepium" agg.", whenever identification is uncertain. The use of this term sometimes creates confusion about which taxon is being discussed.The best way to separate hedge bindweed ("sepium") from the other taxa is by the bracteoles, which subtend the flower and wholly.


Question: What is this animal named after?

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Steller sea lion. The Steller sea lion (Eumetopias jubatus), also known as the Steller's sea lion and northern sea lion, is a near-threatened species of sea lion in the northern Pacific. It is the sole member of the genus "Eumetopias" and the largest of the eared seals (Otariidae). Among pinnipeds, it is inferior in size only to the walrus and the two species of elephant seals. The species is named for the naturalist Georg Wilhelm Steller, who first described them in 1741. The Steller sea lion has attracted considerable attention in recent decades, owing to significant and largely unexplained declines in their numbers.

Steller sea lion. over an extensive portion of their northern range in Alaska.## Description.Adult animals are lighter in color than most sea lions, ranging from pale yellow to tawny and occasionally reddish. Steller sea lion pups are born almost black, weighing around 23 (kg), and remain dark in coloration for several months. Females and males both grow rapidly until the fifth year, after which female growth slows considerably. Adult females measure 2.3 - 2.9 (m) in length, on average being 2.5 (m), and weigh 240 - 350 (kg), with an average of 263 (kg). Males continue to grow until their secondary sexual traits.

Steller sea lion. appear in their fifth to eighth year. Males are slightly longer than the females, growing to about 2.82 – 3.25 (m) long and averaging 3 (m) in length. Males have much wider chests, necks, and general forebody structure. Males can weigh between 450 – 1120 (kg), weighing on average 544 (kg). Males are further distinguished from females by broader and higher foreheads, flatter snouts, and a thick mane of coarse hair around their large necks. It is fitting then that their Latin name translates roughly as "maned one with the broad forehead".## Range.The range of the Steller sea lion extends.

Steller sea lion. from the Kuril Islands in the Sea of Okhotsk in Russia to the Gulf of Alaska in the north, down to Año Nuevo Island off the coast of central California to the south. They formerly bred as far south as the Channel Islands, but have not been observed there since the 1980s. Based on genetic anаlyses and local migration patterns, the global Steller sea lion population has traditionally been divided into an eastern and western stock at 144°W longitude, roughly through the middle of the Gulf of Alaska. Recent evidence suggests the sea lions in Russia in the Sea of.

Steller sea lion. Okhotsk and the Kuril Islands comprise a third Asian stock, while the sea lions on the eastern seaboard of Kamchatka and the Commander Islands belong to the western stock.In the summer, Steller sea lions tend to shift their range somewhat southward. Therefore, though there are no reproductive rookeries in Japan, several consistent haul-out sites are found around Hokkaidō in the winter and spring. Vagrants have been spotted in the Yellow Sea and Bohai Gulf and along the coast of Korea and China. The oldest fossil known of the species was found near Kanazawa, Japan and dates to the late Early.

Steller sea lion. Pleistocene (0.8 Ma).## Ecology.## Habitat.Steller sea lions tend to live in the coastal waters of the subarctic because of the cooler temperate climate of the area. Like all otariids, Steller sea lions are amphibious and spend some time in water and some on land. Typically, Stellar sea lions spend their time in the water feeding but haul-out onto land to reproduce, raise their pups, molt, and rest. Steller sea lions usually congregate on isolated islands because they are the ideal terrestrial habitat. These isolated islands are preferred by Stellar sea lions because they can avoid predation from terrestrial predators, easily.

Steller sea lion. thermoregulate (by means of cooling winds), and access offshore prey more easily. Some haul-out sites, known as rookeries, are commonly used for reproduction while other haul-out sites are used for other purposes like molting. However, both biotic and abiotic factors can influence the amount of time that Steller sea lions spend on land. Haul-out sites and haul-out abundance of the Steller sea lion can be determined by prey availability, predator abundance, tide levels, weather, etc.## Foraging.Steller sea lions are skilled and opportunistic marine predators, feeding on a wide range of fish and cephalopod species. Important diet components include walleye pollock,.

Steller sea lion. Atka mackerel, halibut, herring, capelin, flatfish Pacific cod, rockfish, sculpins, salmon, sand lance, and cephalopods such as various squid and octopus. They seem to prefer schooling fish and forage primarily between intertidal zones and continental shelves. They usually aggregate in groups of up to twelve in areas of prey abundance. They are known to aggregate near fishing vessels, preying on bycatch discards. Most of the data on their foraging comes from data collected off the coast of Alaska; little is known of their foraging behavior elsewhere.The composition of the diet of Steller sea lions varies seasonally and geographically; as opportunistic.

Steller sea lion. predators, they concentrate on the locally most abundant prey species. In addition to their primary marine environment, they sometimes enter estuaries and feed on brackish-water fish such as sturgeon. Very occasionally, they have been known to prey on northern fur seals, harbor seals, and sea otter pups. Records suggest that the range of their prey species has broadened over time.## Predation.Steller sea lions are top-tier carnivores, but are susceptible to predation, primarily by killer whales. Shark species are also possible predators: sleepers and great whites may prey on juvenile sea lions.## Behavior and life history.## Reproduction.Reproductively mature male sea lions.

Steller sea lion. gather together mid-spring on traditional, well-defined reproductive rookeries, usually on beaches on isolated islands. The larger, older males establish and defend distinct territories on the rookery. A week or so later, adult females arrive, accompanied occasionally by sexually immature offspring, and form fluid aggregations throughout the rookery. Like all other otariids, Steller sea lions are polygynous. However, unlike some other species, they do not coerce individual females into harems, but control spatial territories among which females freely move. Steller sea lions have used aquatic, semiaquatic, and terrestrial territories. Males with semiaquatic territories have the most success in defending them. The.

Steller sea lion. boundaries are defined by natural features, such as rocks, faults, or ridges in rocks, and territories can remain stable for 60 days. Though Steller sea lion males are generally tolerant of pups, one male filmed on Medny Island in Russia was documented killing and eating several pups in a first-ever recorded incident of cannibalism. Though researchers are uncertain as to the motives or reasons behind said attacks, it is suggested that the bull involved may have an abnormal personality akin to being psychotic.Pregnant females give birth soon after arriving on a rookery, and copulation generally occurs one to two weeks.

Steller sea lion. after giving birth, but the fertilized egg does not become implanted in the uterus until the fall. A fertilized egg may remain in embryonic diapause for up to three months before implanting and beginning to divide. Twins are rare. After a week or so of nursing without leaving the rookery, females begin to take progressively longer and more frequent foraging trips leaving their pups behind until at some point in late summer, when both the mother and pup leave the rookery together. This maternal attendance pattern is common in otariids. As pups get older the amount of time spent by.

Steller sea lion. females foraging out at sea increases. This continues until pups obtain the ideal body weight and energy reserves to eat on their own. A study conducted by the University of California, Santa Cruz found that on average male pups consume more milk than females. This may be due to the sexual dimorphism common to otariids. Reproductive males fast throughout the reproductive season, often without entering the water once from mid-May until August, when the structure of the reproductive rookeries begins to fall apart and most animals leave for the open seas and disperse throughout their range.The age at weaning is.

Steller sea lion. highly variable; pups may remain with their mothers for as long as four years. Incidents of mothers feeding daughters that are simultaneously feeding their own newborn pups have been documented, which is an extremely rare occurrence among mammals. A study done at Año Nuevo in 1983 found that female attendance and time spent with their pup was shaped by increasing nutritional demands of the pup and the pups suckling efficiency. Females averaged 21 hours ashore and 36 hours at sea. As the pups aged, females began to spend more time at sea again. As the pups matured, specifically at the.

Steller sea lion. sixth week past birth, the mother's sea time declined by 30 percent. There was no relationship between the pups' activity or physical excursion and their suckling time, age, or sex. Their suckling time, and age, and sex are unrelated to their use of energy. Labeled water studies showed that the pups' milk intake had a direct relationship to their size. Pups that consumed more milk were heavier than those that didn't. These findings show that the amount of time females spend onshore with their pups is based on their pup's suckling efficiency and nutritional demands.In the past, the low pup.

Steller sea lion. production has been tied to an increase in nutritional stress found in females. This was believed to have contributed to the decline in Steller sea lions common to Alaska.## Locomotion.The largest of the eared seals, Steller sea lions are quick swimmers, about as fast as the smaller California sea lions. Glide velocity of individual Steller sea lions has been measured as 2.9–3.4 meters or 1.2–1.5 body lengths per second, which is close to the optimal swim velocity of 1.4 body lengths per second based on the minimum cost of transport for California sea lions.A 2007 study of Steller sea lions.

Steller sea lion. found that a majority of thrust was produced during the drive phase of the fore flipper stroke cycle. Although previous findings on eared seals suggested that thrust was generated by the initial outward movement of the foreflippers or the terminal drag-based paddling phase, the 2007 study found that little or no thrust was generated during those phases. Swimming performance in sea lions is modulated by changes in the duration and intensity of movements without changing their sequence. Using criteria based on velocity and the minimum radius of turns, Steller's maneuverability is similar to other eared seals, superior to cetaceans, and.

Steller sea lion. inferior to many fish.## Diving.To be able to dive for a long period of time, Steller sea lions exhibit apnea, bradycardia, and peripheral vasoconstriction. This allows them to maximize their oxygen stores and efficiently forage during their dives. In addition to those adaptations, their thick blubber layer and outer fur layer keep their body insulated during dives.Trained Steller sea lions from Vancouver Aquarium were placed in the open ocean at the University of British Columbia's Open Water Research Station to study their diving metabolism and behavior. Steller sea lions' dives are more energetically costly if they perform dive bouts. The.

Steller sea lion. aerobic diving limit of Steller sea lions was observed to be affected by their nutritional state and feeding.## Communication.Like most otariids, Steller sea lions are vocal in air. Mature male sea lions have a range of vocalizations as part of their territorial behaviors, including belches, growls, snorts, and hisses that serve as warnings to others. Both males and females also produce underwater noises similar to their above water sounds, described as clicks, barks, and belches. The primary function of their vocalizations is for social behavior. Sonogram readings reported that Steller Sea Lions make discrete, low frequency pulses underwater that resemble.

Steller sea lion. the male "belching" territorial noise made in air. These underwater vocalizations have an average of 20–30 pulses per second.Vocalizations are critical to mother-pup pairs, as the mothers must find their pups in a crowded breeding area when they return from foraging. The mother and pup both use distinctive calls, like names, to help differentiate themselves among the crowd of other sea lions. Their aerial vocalizations have been described as similar to the bleats of sheep, and bellows.Because Steller sea lions are sexually dimorphic in size, their hearing differs in sensitivity, possibly due to differences in size of the hearing structures.

Steller sea lion. Females have a higher sensitivity than males, perhaps to hear the higher frequency calls of their pups. The Steller sea lion's hearing range also suggests that they are capable of hearing the underwater calls of one of their main predators, the killer whale.## Interactions with humans.Steller sea lion were hunted for meat and other commodities by prehistoric communities everywhere their range intersected with human communities. Aside from food and clothing, their skin was used to cover baidarkas and kayaks. A subsistence harvest on the order of 300 animals or less continues to this day in some native communities in Alaska.Historically,.

Steller sea lion. the sea lion has had only very slight commercial value. For example, in the 19th century their whiskers sold for a penny apiece for use as tobacco-pipe cleaners.Steller sea lions are sometimes killed intentionally by fishermen, as they are seen as competitors and a threat to fish stocks. Killing sea lions is strictly prohibited in the US and Russia, but in Japan a fixed number are still removed annually, ostensibly to protect their fisheries. In Canada, commercial hunting is prohibited, but limited hunting permits are occasionally granted if local culling is required—for example, nuisance animals destroying fish farms.In recent years,.

Steller sea lion. Steller sea lions have been known to enter the Columbia River estuary and feed on white sturgeon, several salmon species, and rainbow trout, some of which are also listed under the U.S. Endangered Species Act. They are found in the Columbia River nearly year round, with the exception of early summer, going as far upstream as Bonneville Dam. Though not as abundant as the California sea lion, they are still a concern for those agencies charged with managing the fish populations. Since the Steller sea lions are themselves protected under the Marine Mammal Protection Act, managers are compelled to use.

Steller sea lion. nonlethal deterrence methods, such as rubber bullets and noisemakers. Deterrence by the public is strictly forbidden.## Recent decline and subsequent recovery.While the populations of the eastern and Asian stocks appear stable, the population of the western stock, particularly along the Aleutian Islands, was estimated to have fallen by 70–80% since the 1970s. As a consequence, in 1997 the western stock of Steller sea lions was listed as endangered and the eastern stock was listed as threatened under the United States Endangered Species Act. They have since been the object of intense study and the focus of much political and scientific.

Steller sea lion. debate in Alaska.One suspected cause of their precipitous decline was the overfishing of Alaska pollock, herring, and other fish stocks in the Gulf of Alaska. This stems largely from the "junk-food hypothesis" representing a shift in their diet from fatty herring and capelin to leaner fare such as pollock and flounder, thereby limiting their ability to consume and store fat. Other hypotheses include increased predation by orcas and sharks, indirect effects of prey species composition shifts due to changes in climate, effects of disease or contaminants, shooting by fishermen, and others. The decline is certainly due to a complex of.

Steller sea lion. interrelated factors which have yet to be defined by the research effort.Another possible reason for decline in this species has been tied to the Nutritional Stress Hypothesis. The lack of prey corresponds to the decrease in population. In females specifically, obtaining an insufficient amount of nutrients has resulted in the failure to complete their pregnancies to full term.In October 2013, the eastern Steller sea lion was taken off the U.S. Endangered Species List after a major population comeback over the past several years.Eared seal Marine Mammal Center – Steller Sea Lion US National Marine Fisheries Service Steller Sea Lion web.

Steller sea lion. page ARKive – images and movies of the Steller sea lion "(Eumetopias jubatus)" Alaska Department of Fish and Game page on Steller sea lions Overview of Steller sea lion research at NOAA, National Marine Fisheries Service, National Marine Mammal Lab "Nature" documentary about the decline of Steller's sea lions News media report on Steller sea lions and sturgeon interactions SeaLionPredation.com – news and information on seal and sea lion predation of salmon and steelhead in the Pacific Northwest NOAA fact sheet on pinnipeds in the Columbia River Georg Steller's original description in "De Bestiis Marinis, or, The Beasts of the.

Steller sea lion. Sea" (1751) Watch more Steller sea lion (Eumetopias jubatus) video clips from the BBC archive on Wildlife Finder Fifteen years of research into the Alaska populations of Steller Sea Lions at the Alaska SeaLife Center WATCH: Sea lions ward off attacking orcas.


Question: Which mountain range is this mountain belong to?

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Salève. The Salève (), or Mont Salève, is a mountain of the French Prealps located in the department of Haute-Savoie in Auvergne-Rhône-Alpes. It is also called the "Balcony of Geneva" (French: "Balcon de Genève").## Geography.Geographically, the Salève is a mountain of the French Prealps located in the Haute-Savoie department, but geologically a part of the Jura chain, as the Vuache is. Below the Salève is the Geneva urban area where more than 700,000 people live.The Salève consists of the Pitons, Grand Salève and Petit Salève; it culminates at 1,379 metres at the Grand Piton. It is accessible via the Téléphérique du.


Question: Who found this aircraft?

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Beechcraft. Kansas, in 1932 by Walter Beech as president, his wife Olive Ann Beech as secretary, Ted A. Wells as vice president of engineering, K. K. Shaul as treasurer, and investor C. G. Yankey as vice president. The company began operations in an idle Cessna factory. With designer Ted Wells, they developed the first aircraft under the Beechcraft name, the classic Beechcraft Model 17 Staggerwing, which first flew in November 1932. Over 750 Staggerwings were built, with 352 manufactured for the United States Army Air Forces and 67 for the United States Navy during World War II.Beechcraft was not Beech's first.

Beechcraft. after the sudden death of her husband from a heart attack on November 29 of that year. She continued as CEO until Beech was purchased by Raytheon Company on February 8, 1980. Ted Wells had been replaced as chief engineer by Herbert Rawdon, who remained at the post until his retirement in the early 1960s.Throughout much of the mid-to-late 20th century, Beechcraft was considered one of the "Big Three" in the field of general aviation manufacturing, along with Cessna and Piper Aircraft.In 1994, Raytheon merged Beechcraft with the Hawker product line it had acquired in 1993 from British Aerospace, forming.


Question: How long in metre is the longest span of this island?

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Confederation Bridge. ship traffic. The bridge rests on 62 piers, of which the 44 main piers are 250 (m) apart. The bridge is 11 (m) wide.The speed limit on the bridge is 80 (km/h) but can vary with wind and weather conditions. When travelling at the speed limit, it takes about 12 minutes to cross the bridge.## Tolls.Tolls apply only when leaving Prince Edward Island (when travelling westbound). The toll rates are $50.25 for a two-axle automobile and $8.50 for each additional axle. Motorcycles are charged $20.00. While pedestrians and cyclists are not permitted to cross the bridge, a shuttle service is.


Question: What is the location of this building?

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Venetian Towers. The Venetian Towers (in Catalan: "Torres Venecianes") is the popular name for a pair of towers on Avinguda de la Reina Maria Cristina at its junction with Plaça d'Espanya in Barcelona, Catalonia, Spain. There is one tower on either side of the street.The towers are 47m high, with a 7.2 metres square cross-section. The bottom section of each is built of artificial stone, the main section of red brick, and the top section is a colonnaded viewing gallery built of artificial stone, and topped by a pyramidal copper roof. They were modelled on the campanile of St. Mark's Basilica in.


Question: What is the source of energy of this vehicle?

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Steam locomotive. A steam locomotive is a locomotive that provides the force to move itself and other vehicles by means of the expansion of steam. It is fuelled by burning combustible material (usually coal, oil or, rarely, wood) to heat water in the locomotive's boiler to the point when it becomes gaseous and its volume increases 1,700 times. Functionally, it is a steam engine on wheels.In most locomotives, the steam is admitted alternately to each end of its cylinders, in which pistons are mechanically connected to the locomotive's main wheels. Fuel and water supplies are usually carried with the locomotive, either on.

Steam locomotive. a train along the tramway from the Pen-y-darren ironworks, near Merthyr Tydfil, to Abercynon in South Wales. Accompanied by Andrew Vivian, it ran with mixed success. The design incorporated a number of important innovations that included using high-pressure steam which reduced the weight of the engine and increased its efficiency.Trevithick visited the Newcastle area in 1804 and had a ready audience of colliery (coal mine) owners and engineers. The visit was so successful that the colliery railways in north-east England became the leading centre for experimentation and development of the steam locomotive. Trevithick continued his own steam propulsion experiments through.

Steam locomotive. Völklingen), but neither could be returned to working order after being dismantled, moved and reassembled. On 7 December 1835, the "Adler" ran for the first time between Nuremberg and Fürth on the Bavarian Ludwig Railway. It was the 118th engine from the locomotive works of Robert Stephenson and stood under patent protection.In Russia, the first steam locomotive was built in 1834 by Cherepanovs, however, it suffered from the lack of coal in the area and was replaced with horse traction after all the woods nearby had been cut down. The first Russian Tsarskoye Selo steam railway started in 1837 with.

Steam locomotive. Hungary which used the water-tube Brotan boiler.A boiler consists of a firebox where the fuel is burned, a barrel where water is turned into steam and a smokebox which is kept at a slightly lower pressure than outside the firebox.Solid fuel, such as wood, coal or coke, is thrown into the firebox through a door by a fireman, onto a set of grates which hold the fuel in a bed as it burns. Ash falls through the grate into an ashpan. If oil is used as the fuel, a door is needed for adjusting the air flow, maintaining the firebox,.

Steam locomotive. This pressure difference causes air to flow up through the coal bed and keeps the fire burning.The search for thermal efficiency greater than that of a typical fire-tube boiler led engineers, such as Nigel Gresley, to consider the water-tube boiler. Although he tested the concept on the LNER Class W1, the difficulties during development exceeded the will to increase efficiency by that route.The steam generated in the boiler not only moves the locomotive, but is also used to operate other devices such as the whistle, the air compressor for the brakes, the pump for replenishing the water in the boiler.

Steam locomotive. in various configurations, including two tanks alongside (side tanks or pannier tanks), one on top (saddle tank) or one between the frames (well tank).The fuel used depended on what was economically available to the railway. In the UK and other parts of Europe, plentiful supplies of coal made this the obvious choice from the earliest days of the steam engine. Until 1870, the majority of locomotives in the United States burned wood, but as the Eastern forests were cleared, coal gradually became more widely used until it became the dominant fuel worldwide in steam locomotives. Railways serving sugar cane farming.

Steam locomotive. operations burned bagasse, a byproduct of sugar refining. In the US, the ready availability and low price of oil made it a popular steam locomotive fuel after 1900 for the southwestern railroads, particularly the Southern Pacific. In the Australian state of Victoria, many steam locomotives were converted to heavy oil firing after World War II. German, Russian, Australian and British railways experimented with using coal dust to fire locomotives.During World War 2, a number of Swiss steam shunting locomotives were modified to use electrically heated boilers, consuming around 480 kW of power collected from an overhead line with a pantograph.

Steam locomotive. These locomotives were significantly less efficient than electric ones; they were used because Switzerland was suffering a coal shortage because of the War, but had access to plentiful hydroelectricity.A number of tourist lines and heritage locomotives in Switzerland, Argentina and Australia have used light diesel-type oil.Water was supplied at stopping places and locomotive depots from a dedicated water tower connected to water cranes or gantries. In the UK, the US and France, water troughs ("track pans" in the US) were provided on some main lines to allow locomotives to replenish their water supply without stopping, from rainwater or snowmelt that.

Steam locomotive. be removed by hand at the end of the run. As with the arrestor, a screen was incorporated to retain any large embers.Locomotives of the British Railways standard classes fitted with self-cleaning smokeboxes were identified by a small cast oval plate marked "S.C.", fitted at the bottom of the smokebox door. These engines required different disposal procedures and the plate highlighted this need to depot staff.## Stokers.A factor that limits locomotive performance is the rate at which fuel is fed into the fire. In the early 20th century some locomotives became so large that the fireman could not shovel coal.

Steam locomotive. such equipment.Booster engines were also fitted to tender trucks in the US and known as auxiliary locomotives. Two and even three truck axles were connected together using side rods which limited them to slow-speed service.## Firedoor.The firedoor is used to cover the firehole when coal is not being added. It serves two purposes, first, it prevents air being drawn over the top of the fire, rather forcing it to be drawn through it. The second purpose is to safeguard the train crew against blowbacks. It does, however, have a means to allow some air to pass over the top of.

Steam locomotive. of smoke for the engine driver to breathe as the locomotive passed through mountain tunnels and snow sheds. Another variation was the Camelback locomotive, with the cab situated halfway along the boiler. In England, Oliver Bulleid developed the SR Leader class locomotive during the nationalisation process in the late 1940s. The locomotive was heavily tested but several design faults (such as coal firing and sleeve valves) meant that this locomotive and the other part-built locomotives were scrapped. The cab-forward design was taken by Bulleid to Ireland, where he moved after nationalisation, where he developed the "turfburner". This locomotive was more.

Steam locomotive. steam is either a by-product or is cheaply available). The water vessel ("boiler") is heavily insulated, the same as with a fired locomotive. Until all the water has boiled away, the steam pressure does not drop except as the temperature drops.Another class of fireless locomotive is a compressed-air locomotive.## Mixed power.## Steam diesel hybrid locomotive.Mixed power locomotives, utilising both steam and diesel propulsion, have been produced in Russia, Britain and Italy.## Electric-steam locomotive.Under unusual conditions (lack of coal, abundant hydroelectricity) some locomotives in Switzerland were modified to use electricity to heat the boiler, making them electric-steam locomotives.## Steam-electric locomotive.A steam-electric.

Steam locomotive. railways used dynamometer cars to measure tractive force at speed in actual road testing.British railway companies have been reluctant to disclose figures for drawbar horsepower and have usually relied on continuous tractive effort instead.## Relation to wheel arrangement.Classification is indirectly connected to locomotive performance. Given adequate proportions of the rest of the locomotive, power output is determined by the size of the fire, and for a bituminous coal-fuelled locomotive, this is determined by the grate area. Modern non-compound locomotives are typically able to produce about 40 drawbar horsepower per square foot of grate. Tractive force, as noted earlier, is largely.

Steam locomotive. solids on the inside the surfaces of pipes and heat exchangers. This precipitation is principally caused by thermal decomposition of bicarbonate ions but also happens in cases where the carbonate ion is at saturation concentration. The resulting build-up of scale restricts the flow of water in pipes. In boilers, the deposits impair the flow of heat into the water, reducing the heating efficiency and allowing the metal boiler components to overheat.The reciprocating mechanism on the driving wheels of a two-cylinder single expansion steam locomotive tended to pound the rails (see hammer blow), thus requiring more maintenance. Raising steam from coal.

Steam locomotive. took a matter of hours, and created serious pollution problems. Coal-burning locomotives required fire cleaning and ash removal between turns of duty. Diesel or electric locomotives, by comparison, drew benefit from new custom-built servicing facilities. The smoke from steam locomotives was also deemed objectionable; the first electric and diesel locomotives were developed in response to smoke abatement requirements, although this did not take into account the high level of less-visible pollution in diesel exhaust smoke, especially when idling. In some countries, however, power for electric locomotives is derived from steam generated in power stations, which are often run by coal.##.

Steam locomotive. Unknown Warrior" project, GWR "47xx 4709, 2999 "Lady of Legend", 1014 "County of Glamorgan" and 6880 "Betton Grange" projects. These United Kingdom based new build projects are further complemented by the new build Pennsylvania Railroad 5550 project in the United States. One of the group's goals is to surpass the steam locomotive speed record held by the 4468 "Mallard" when the 5550 is completed and for the 5550 to fill in a huge gap in steam locomotive preservation.In 1980, American financier Ross Rowland established American Coal Enterprises to develop a modernised coal-fired steam locomotive. His ACE 3000 concept attracted considerable.

Steam locomotive. same company also rebuilt a German DR Class 52.80 2-10-0 locomotive to new standards with modifications such as roller bearings, light oil firing and boiler insulation.## Climate change.The future use of steam locomotives in the United Kingdom is in doubt because of government policy on climate change. The Heritage Railway Association is working with the All-Party Parliamentary Group on Heritage Rail in an effort to continue running steam locomotives on coal.Many tourist railroads use oil-fired steam locomotives (or have converted their locomotives to run on oil) to reduce their environmental footprint, and because fuel oil can be easier to obtain.

Steam locomotive. than coal of the proper type and sizing for locomotives. For example, the Grand Canyon Railway runs its steam locomotives on used vegetable oil.An organization called the Coalition for Sustainable Rail (CSR) is developing an environmentally friendly coal substitute made from torrefied biomass. In early 2019, they performed a series of tests using Everett Railroad to evaluate the performance of the biofuel, with positive results. The biofuel was found to burn slightly faster and hotter than coal. The goal of the project is primarily to find a sustainable fuel for historic steam locomotives on tourist railroads, but CSR has also.


Question: Where is this object originally invented or found?

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Parka. A parka or anorak is a type of coat with a hood, often lined with fur or faux fur. This kind of garment is a staple of Inuit clothing, traditionally made from caribou or seal skin, for hunting and kayaking in the frigid Arctic. Some Inuit anoraks require regular coating with fish oil to retain their water resistance.The words "anorak" and "parka" have been used interchangeably, but they are somewhat different garments. Strictly speaking, an anorak is a waterproof, hooded, pull-over jacket without a front opening, and sometimes drawstrings at the waist and cuffs, and a parka is a hip-length.

Parka. is sometimes used as a mildly derogatory term.The word "parka" is derived from the Nenets language. In the Aleutian Islands the word simply means "animal skin". It first entered the English written record in a 1625 work by Samuel Purchas.The Inuit who speak Inuktitut use parkas and have various terms related to them as follows:## N-3B ("scrub snorkel" or "snorkel") parka.The original snorkel parka (USAF N-3B parka, which is 3/4 length and has a full, attached hood; the similar N-2B parka is waist-length and has an attached split hood) was developed in the United States during the early 1950s for.

Parka. pocket. It was invented by Noel Bibby of Peter Storm Ltd. in the early 1960s. It may have a full-zippered front opening, or pull over the head like an original anorak and close with snaps or a short zipper, has an integral hood, and elasticated or drawstring cuffs. In some versions, when rolled up, the hood doubles as a bag into which the rest of the coat is pushed. It became very popular in the United Kingdom during the 1970s.Anorak (slang)Capote (garment)Goggle jacketHoodieMackintoshYup'ik clothing"The Anorak", a play about the Montreal Massacre written and performed by Adam KellyA traditional Inuit parka.


Question: Which location has this animal invaded?

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Wild boar. the tiger and Komodo dragon respectively. The wild boar has a long history of association with humans, having been the ancestor of most domestic pig breeds and a big-game animal for millennia. Boars have also re-hybridized in recent decades with feral pigs; these boar–pig hybrids have become a serious pest wild animal in the Americas and Australia.## Terminology.As true wild boars became extinct in Great Britain before the development of Modern English, the same terms are often used for both true wild boar and pigs, especially large or semi-wild ones. The English "boar" stems from the Old English , which.


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Hanauma Bay. the vicinity, the area was not inhabited, although archeologists have found fishing tools and other indications of human presence there. The bay was used as a recreational area by "aliʻi" (Hawaiian nobility), including King Kamehameha and Queen Ka‘ahumanu, who fished, entertained visitors, and sponsored games there. It was also used as a layover and as a navigational lookout point, since the waters between Oʻahu and Molokaʻi are at times difficult.Hanauma Bay was purchased from the Bernice Pauahi Bishop estate by the City and County of Honolulu, and subsequently opened for public use. It was initially a favorite fishing and picnic.


Question: What are the locomotion methods of this animal?

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Hedgehog. belly, which are not quilled. Since the effectiveness of this strategy depends on the number of spines, some desert hedgehogs that evolved to carry less weight are more likely to flee or attack, ramming an intruder with the spines; rolling into a spiny ball for those species is a last resort. Hedgehogs are primarily nocturnal, though some species can also be active during the day. Hedgehogs sleep for a large portion of the day under bushes, grasses, rocks, or most commonly in dens dug in the ground, with varying habits among the species. All wild hedgehogs can hibernate, though not.


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Thermometer. in medicine, and in scientific research.## History.While an individual thermometer is able to measure degrees of hotness, the readings on two thermometers cannot be compared unless they conform to an agreed scale. Today there is an absolute thermodynamic temperature scale. Internationally agreed temperature scales are designed to approximate this closely, based on fixed points and interpolating thermometers. The most recent official temperature scale is the International Temperature Scale of 1990. It extends from 0.65 (K) to approximately 1358 (K).## Early developments.Various authors have credited the invention of the thermometer to Hero of Alexandria. The thermometer was not a single invention,.

Thermometer. however, but a development.Hero of Alexandria (10–70 AD) knew of the principle that certain substances, notably air, expand and contract and described a demonstration in which a closed tube partially filled with air had its end in a container of water. The expansion and contraction of the air caused the position of the water/air interface to move along the tube.Such a mechanism was later used to show the hotness and coldness of the air with a tube in which the water level is controlled by the expansion and contraction of the gas. These devices were developed by several European scientists.

Thermometer. graduations based on the melting and boiling points of water as standards and, in 1694, Carlo Renaldini (1615–1698) proposed using them as fixed points along a universal scale. In 1701, Isaac Newton (1642–1726/27) proposed a scale of 12 degrees between the melting point of ice and body temperature.## Era of precision thermometry.In 1714, scientist and inventor Daniel Gabriel Fahrenheit invented a reliable thermometer, using mercury instead of alcohol and water mixtures. In 1724, he proposed a temperature scale which now (slightly adjusted) bears his name. In 1742, Anders Celsius (1701–1744) proposed a scale with zero at the boiling point and.


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Maryland State Fair. Maryland. Despite its success, the Lutherville Fair was short-lived because an extension of the Northern Central Railroad (the former Baltimore and Susquehanna Railroad) was being constructed through the middle of the fairgrounds.Their success in Lutherville, however, gave the operators resolve to establish an annual fair, and in December 1878, they incorporated as the Agricultural Society of Baltimore County. The corporation leased a 37 (acre) plot of land on the old Baltimore and York Turnpike on what was then known as "the Timonium Estate." The first Fair at its new home was held September 9–12, 1879. The Northern Central Railroad, the.

Maryland State Fair. diesel buses brought visitors to the Fair in addition to the thousands of cars parked on acres of lots around the grounds for that last week of summer.Late in the century, The Agricultural Society of Baltimore County faced stiff competition from the nearby Pimlico Fair, also referred to as "the State Fair". Ultimately, the two groups held joint fairs in 1894 and 1897, and in 1906, merged to form one corporation - "the Maryland State Fair and Agricultural Society of Baltimore County, Maryland". Their annual Fair then became known as "The Maryland State Fair".The early years at the Fair saw.

Maryland State Fair. Fair was interrupted because of the war effort in World War II. The fairgrounds were leased to the U.S. Army for a storage depot and a vehicle repair center. After a three-year suspension, the Fair reopened its gates in 1946.In 1999, the Fair added another day, making the Fair now an 11-day event.In 2020, the fair was restricted to private livestock and other virtual shows due to the COVID-19 pandemic.## Timonium Race Track.In the 1950s, growth in population and development in increasingly suburban Baltimore County flourished, and certain business interests wanted to purchase the fairgrounds site for industrial development. The.