File:Duplex Escapement.png

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DescriptionDuplex Escapement.png	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.
Date	1873
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
Author	Harry Leonard Nelthropp
Permission (Reusing this file)	Public domain - author died more than 70 years ago

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	10:08, 16 October 2007		640 × 726 (26 KB)	Chetvorno (talk \| contribs)	{{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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