Ketasrull (inglise centrepin reel, centerpin reel, center pin reel, float reel; vene бapaбaHHaя kaTyшka), inertsiaalne õngerull, mille trummel (pool, ketas) õngenööri peale- ja mahakerimisel pöörleb; rullil puudub reduktor, st et ülekanne on 1:1 – ühele käega tehtavale pöördele vastab ka üks trumlipööre. Vanim rullitüüp, mida kasutati juba vähemasti 1000 a eest Hiinas, Euroopas on teada ketasrulli kasutamine Inglismaal 17. saj keskpaigast lendõngerullina.
Ketasrull koosneb laias laastus nööritrumlist ja tugikettast, mille all on rulli jalg ja keskel tihvt trumli kinnitamiseks.
Euroopas levisid nn nottinghami rullid, mille trummel valmistati tihedast väärispuidust (kreeka pähklist), et see vett ei imaks, teiste detailide puhul ka metalle (vask, pronks, messing, teras, nikkel, hõbe) ja nt elevandiluud (kerimisnupp). Tollased rullid olid mõeldud esmajoones nööri hoiupaigaks, nendega sai heita vaid raskeid lante ja heited olid lühikesed. Lantide heitmiseks tuli trummel muuta senisest kergemaks ning panna see pöörlema kuullaagritele. Niisugused rullid, mida hakati nimetama centerpinideks (ka centrepinideks), loodi 19. sajandi teisel poolel. Nende metalltrumlid tehti kaalu vähendamiseks sõrestikulisena. Centrepini arendasid David Slater ja Henry Coxon, kes patenteerisid oma arendused vastavalt 1883 ja 1896: sündisid rullimudelid Coxon-Aerial ja hiljem Allcock-Aerial – ketasrullide kõrgtase kehastus aga mudelis Aerial Match, mis loodi 1940 paiku. Aerial sai Euroopas õhuliste metallr.
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Cutting Knowledge Date: December 2023
Today Date: 26 Jul 2024

<|eot_id|><|start_header_id|>user<|end_header_id|>

Below is an extract from a web page. Evaluate whether the page has a high educational
value and could be useful in an educational setting for teaching from primary school to
grade school levels using the additive 5-point scoring system described below. Points are
accumulated based on the satisfaction of each criterion:
- Add 1 point if the extract provides some basic information relevant to educational top-
ics, even if it includes some irrelevant or non-academic content like advertisements and
promotional material.
- Add another point if the extract addresses certain elements pertinent to education but
does not align closely with educational standards. It might mix educational content with
non-educational material, offering a superficial overview of potentially useful topics, or
presenting information in a disorganized manner and incoherent writing style.
- Award a third point if the extract is appropriate for educational use and introduces key
concepts relevant to school curricula. It is coherent though it may not be comprehensive
or could include some extraneous information. It may resemble an introductory section of
a textbook or a basic tutorial that is suitable for learning but has notable limitations like
treating concepts that are too complex for grade school students.
- Grant a fourth point if the extract highly relevant and beneficial for educational purposes
for a level not higher than grade school, exhibiting a clear and consistent writing style. It
could be similar to a chapter from a textbook or a tutorial, offering substantial educational
content, including exercises and solutions, with minimal irrelevant information, and the
concepts aren’t too advanced for grade school students. The content is coherent, focused,
and valuable for structured learning.
- Bestow a fifth point if the extract is outstanding in its educational value, perfectly suited for
teaching either at primary school or grade school. It follows detailed reasoning, the writing
style is easy to follow and offers profound and thorough insights into the subject matter,
devoid of any non-educational or complex content.
The extract: Ketasrull (inglise centrepin reel, centerpin reel, center pin reel, float reel; vene бapaбaHHaя kaTyшka), inertsiaalne õngerull, mille trummel (pool, ketas) õngenööri peale- ja mahakerimisel pöörleb; rullil puudub reduktor, st et ülekanne on 1:1 – ühele käega tehtavale pöördele vastab ka üks trumlipööre. Vanim rullitüüp, mida kasutati juba vähemasti 1000 a eest Hiinas, Euroopas on teada ketasrulli kasutamine Inglismaal 17. saj keskpaigast lendõngerullina.
Ketasrull koosneb laias laastus nööritrumlist ja tugikettast, mille all on rulli jalg ja keskel tihvt trumli kinnitamiseks.
Euroopas levisid nn nottinghami rullid, mille trummel valmistati tihedast väärispuidust (kreeka pähklist), et see vett ei imaks, teiste detailide puhul ka metalle (vask, pronks, messing, teras, nikkel, hõbe) ja nt elevandiluud (kerimisnupp). Tollased rullid olid mõeldud esmajoones nööri hoiupaigaks, nendega sai heita vaid raskeid lante ja heited olid lühikesed. Lantide heitmiseks tuli trummel muuta senisest kergemaks ning panna see pöörlema kuullaagritele. Niisugused rullid, mida hakati nimetama centerpinideks (ka centrepinideks), loodi 19. sajandi teisel poolel. Nende metalltrumlid tehti kaalu vähendamiseks sõrestikulisena. Centrepini arendasid David Slater ja Henry Coxon, kes patenteerisid oma arendused vastavalt 1883 ja 1896: sündisid rullimudelid Coxon-Aerial ja hiljem Allcock-Aerial – ketasrullide kõrgtase kehastus aga mudelis Aerial Match, mis loodi 1940 paiku. Aerial sai Euroopas õhuliste metallr.
After examining the extract:
- Briefly justify your total score, up to 100 words.
- Conclude with the score using the format: "Educational score: <total points>"<|eot_id|>
<|start_header_id|>assistant<|end_header_id|>

The extract provides basic information on the history and mechanics of centerpin reels, but it lacks coherence and clarity, making it challenging for primary or grade school students to understand. The text includes technical terms and complex concepts, limiting its educational value for younger students.

Educational score: 2