翻訳と辞書 Words near each other ・ Pierre Le Gloan ・ Pierre le Grand ・ Pierre le Grand (pirate) ・ Pierre Le Gros ・ Pierre Le Gros the Elder ・ Pierre Le Gros the Younger ・ Pierre Le Guennec ・ Pierre Le Moyne d'Iberville ・ Pierre Le Muet ・ Pierre le Pelley I ・ Pierre le Pelley II ・ Pierre le Pelley III ・ Pierre Le Pesant, sieur de Boisguilbert ・ Pierre le Picard ・ Pierre Le Roux ・ Pierre Le Roy ・ Pierre Le Roy de Boiseaumarié ・ Pierre Le Tellier ・ Pierre Le Tessier ・ Pierre le Vif ・ Pierre Lebeau ・ Pierre Leboucher ・ Pierre LeBrun ・ Pierre Lebréton ・ Pierre Lechantre ・ Pierre Lecomte du Noüy ・ Pierre Ledron ・ Pierre Leemans ・ Pierre Lees-Melou ・ Pierre Lefaucheux Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pierre Le Roy ： ウィキペディア英語版 Pierre Le Roy Pierre Le Roy (1717–1785) was a French clockmaker. He was the inventor of the detent escapement, the temperature-compensated balance and the isochronous balance spring. His developments are considered as the foundation of the modern precision clock. Le Roy was born in Paris, eldest son of Julien Le Roy, a clockmaker to Louis XV who had worked with Henry Sully,〔(''Encyclopedia of time'' Samuel L. Macey p.348 )〕 in which place Pierre Le Roy succeeded his father. ==Invention of the detent escapement== In 1748, he invented a pivoted detent type of escapement,〔''Britten's Watch & Clock Makers' Handbook Dictionary & Guide Fifteenth Edition'' p.122 ()〕 or detached escapement,〔 which makes him the inventor of the detent escapement:〔 "The invention of the detached escapement belongs to P. Le Roy".〔(''A Journal of natural philosophy, chemistry and the arts'' p.159 )〕 He was distinguished principally in his mastery and improvement of the clock and chronograph, above all of the marine chronometer, in which he carried forward the pioneering work of John Harrison. He took a different approach from that of Harrison, believing that the way to achieve seaworthiness was to detach the escapement from the balance.〔''Biographical dictionary of the history of technology'' Lance Day, Ian McNeil p.429 ()〕 He also differed from Harrison regarding his temperature compensation method, which used the variation of the rotation radius of the balance by modifying the diameter of the balance through bi-metallic components, a method which would become a standard in chronometers.〔 His technique for temperature compensation was highly efficient in that it worked without changing the length of the spiral balance spring, which he had discovered to be isochronous only at a precise given length (i.e. when frequency is independent of amplitude, so that a mechanical clock or watch runs at the same rate regardless of changes in its drive force, so it keeps correct time as the mainspring unwinds).〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pierre Le Roy」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.