Description: 1777 Abraham Louis Perrelet modified the 1 dial watch to 2 dial working on a watchThe Swiss watchmaker Abraham Louis Perrelet invented a self-winding mechanism in 1770 for pocket watches.It worked on the same principle as a modern pedometer, and was designed to wind as the owner walked,using an oscillating weight inside the large watch that moved up and down. The Geneva Society of Arts reported in 1776 that fifteen minutes walking was necessary to wind the watch sufficiently for eight days, and the following year reported that it was selling well. 143 years ago Self- winding mechanisms by August Ritter von Lohr of Austria patented in the 1880's Self winding mechanisms were more successful in wristwatches because a person's arm moves much more during daily activities than his torso, where a pocketwatch is kept; the rotor could operate every time the owner moved his or her arm.The first self-winding wristwatch did not appear until after World War I, when wristwatches became popular.It was invented by a watch repairer from the Isle of Man named John Harwood in 1923,who took out a UK patent with his financial backer, Harry Cutts, on 7 July 1923, and a corresponding Swiss patent on 16 October 1923.The Harwood system used a pivoting weight which swung as the wearer moved, and which in turn wound the mainspring.The ratchet mechanism only wound the mainspring when moving in one direction. The weight didn't rotate a full 360°;spring bumpers limited its swing to about 180°, to encourage a back and forth motion.This early type of self-winding mechanism is now referred to as a 'hammer' or 'bumper'.
Price: 750 USD
Location: Smithtown, New York
End Time: 2024-08-23T18:20:43.000Z
Shipping Cost: 9 USD
Product Images
Item Specifics
All returns accepted: ReturnsNotAccepted
Unit Type: Unit
Country/Region of Origin: Switzerland
Color: Brounis
Original/Reproduction: Original
Style: Antique
Material: steel and brass
Unit Quantity: 1
Maker: Abraham Luis Perrelet
Age: 1777
