Last update Nov. 27th. 2014

Wanted  Item
 
L. Mouttet - Mainspring Barrel Dynamometer
 
Image from the Favorite 1960's catalogue, showing the mainspring barrel torque testing apparatus designed by L. Mouttet.
 
Diagram showing typical torque of the watch mainspring delivered to the watch as function of the number of turns of the mainspring and the variance of the mainspring strength.

Mouttet device is designed to measure torque of any given watch mainspring at any point of winding of the mainspring within the barrel.

 
In 1955 Mouttet device was patented in USA. There is description and a few drawings explaining the workings of the device.

  US2715334

 
 
  
  
  
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