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Image: Duplex Escapement

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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.
Title: Duplex Escapement
Credit: 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: Public domain - author died more than 70 years ago
Usage Terms: Public domain
License: Public domain
Attribution Required?: No

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