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File:Duplex Escapement.png

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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.
Date
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/TimeThumbnailDimensionsUserComment
current10:08, 16 October 2007Thumbnail for version as of 10:08, 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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