- Senior Member & WIS
- Posts: 5870
- Joined: June 11th 2011, 10:00pm
"It's indisputably true that Breguet invented the tourbillon with the intention of creating something that would improve the performance of a watch. At the same time that Breguet created the tourbillon – his patent is from 1801 – he also created a controversy. The tourbillon is supposed to do something very specific: reduce the rate variation between the flat positions of a watch, and the vertical positions, to an absolute minimum. Enthusiasts who are interested in precision know that a watch runs at slightly different rates in each of the classic positions in which a watch is timed. These are the vertical positions (or hanging positions) which are crown up, down, left, and right, and the flat, or horizontal positions: dial up and dial down. George Daniels succinctly states the purpose of the tourbillon in his book Watchmaking, "The purpose of the invention was to eliminate errors of poise in the balance by revolving the escapement continuously to produce a uniform average rate." "