Romain Gauthier Logical One

Courtesy of Romain Gauthier

Logical One features a triple patent-pending Romain Gauthier flat chain-and-fusee style constant force system with ruby chain links, ergonomic push button winding system, dial-side visible balance, mainspring barrel with sapphire inserts, plus a 60-hour power reserve indicator.

"Coming from an engineering background, it appeared strange to have a high precision machine forced to run at varying power levels. So I started with the premise that it would be better to have constant energy."    Romain Gauthier

Courtesy of Romain Gauther

CONSTANT FORCE
The vast majority of machines run on constant force: Cars and planes don?t start running slower as fuel runs low and machines receive the same voltage no matter how much electricity is produced. 

Yet the power that runs and regulates the vast majority of high precision mechanical timepieces varies greatly according to the state of wind of the mainspring. 

Constant force is one of the holy grails of horology and with Logical One, Romain Gauthier has reinvented the chain-and-fusee ? one of the oldest and most traditional methods of supplying constant force to a watch/clock movement ? making it both more reliable, more effective . . . and more constant.


CHAIN AND FUSEE
A fusee is a cone-shaped pulley wound with a cord or chain that is attached to the mainspring barrel. Fusees have been used since 15th century to improve timekeeping by compensating for the diminishing torque/power of the mainspring as it ran down. However the traditional chain and fusee has two inherent problems:

1. The multiple layers of chain (often eight turns) on the fusee mean that the individual links have to be small, which means that they are relatively weak.

2. The chain is often transmitting force between the fusee and mainspring barrel at an angle, which is both inefficient and adds stress.

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