Image:Duplex Escapement.png

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[edit] Summary

Description

Drawing of duplex escapement, invented by Thomas Tyrer around 1760. Parts: (A) escape wheel, (B) locking tooth, (C) impulse tooth, (D) pallet, (E) ruby roller. The pallet is shown in dotted lines because it is mounted above the escape wheel and ruby roller. The pallet and roller are on the balance wheel arbor, but the balance wheel itself is not shown. Alterations: using a graphics editor I drew in one of the impulse teeth that had apparently been left out of the original drawing, and replaced the original letters identifying parts with colored ones in a different order.
Source

Downloaded from Harry Leonard Nelthropp (1873) A Treatise on Watchwork, Past and Present, E.&F.N.Spon, London, Fig.12, p.163 on Google Books
Date

1873
Author

Harry Leonard Nelthropp
Permission
(Reusing this image)

Public domain - author died more than 70 years ago

[edit] Licensing

Public domain This image (or other media file) is in the public domain because its copyright has expired.

This applies to the United States, Canada, the European Union and those countries with a copyright term of life of the author plus 70 years.

Note that a few countries have copyright terms longer than 70 years: Mexico has 100 years, Colombia has 80 years, and Guatemala and Samoa have 75 years. This image may not be in the public domain in these countries, which moreover do not implement the rule of the shorter term. Côte d'Ivoire has a general copyright term of 99 years and Honduras has 75 years, but they do implement that rule of the shorter term.

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File history

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Date/TimeDimensionsUserComment
current10:08, 16 October 2007640×726 (26 KB)Chetvorno ({{Information |Description=Drawing of duplex escapement, invented by Thomas Tyrer around 1760. With a graphics editor I drew in one of the impulse teeth that had apparently been left out of the original drawing, and added the letters. Parts: (A) escape )
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