Specification of James Ferguson Cole - Chronometers - No. 4530

Catalogue no: 1024
Dewey No: Subject(s): Patents
Author(s): James Ferguson Cole
Total pages: 5 Illustrations: 1 fold out Language(s): English Publication date: 1821
Editor: Publisher: The Great Seal Patent Office
Dimensions: 290mm x 200mm Condition: Blue paper covers fragile
Related titles: Its About Time, by P. Chamberlain, pp 402-10. Related library records:
Relating to, "Certain Improvements in Chronometers". Chamberlain describes this patent, "It was a pivoted detent escapement with safety pin, a locking plate on the balance staff, the passing spring in a reversed position, balance of a solid steel disc turned thin between hub and rim, a compensation giving effective lengths to balance spring and adjusted by tangent screw". Reprint of 1857
Room location: Library Cabinet: Q Shelf: 4
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