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Bernard M -- Taipei English Tutor

Bernard M - English Conversation / TOEFL / IELTS 一對一英文會話

Sunday, May 28, 2017

Verge Escapement or Crown-wheel Escapement

A type of escapement used in most clocks until the invention of the more accurate ancre escapement in the 1670s. It was first drawn up by Giovanni da Dondi, Paduan professor, in 1364. It comprises a toothed wheel and a verge (shaft), with two pallets released in turn by a foliot (large horizontal bar) or balance (wheel)._

Judith Miller. The Illustrated Dictionary of Antiques & Collectibles. Bullfinch Press Book_Marshall Editions Development, 2001

Apparently this was one of the few key European inventions not totally borrowed or inspired by China. Su Song's [子容[1] 1020–1101 AD] astronomical clock tower already used an escapement, but according to Carlo Cipolla the two inventions "had nothing in common"  [quoted in Cathedral, Forge, and Waterwheel by Frances and Joseph Gies]
https://www.wikiwand.com/en/Su_Song

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