GOVERNOR

A DEVICE FOR SLOWING AND REGULATING MOTION.
IN STRIKING CLOCKS AND WATCHES, THE FLY WHEEL HAS VANES WHICH REGULATE THE SPEED OF THE STRIKING TRAIN. THE SAME RESULT IS ACHIEVED BY A CENTRIFUGAL GOVERNOR OR BY THE ESCAPEMENT: A LEVER ESCAPEMENT FOR CERTAIN STRIKING MECHANISMS (INVENTED BY JULIEN LE ROY IN 1755); A VERGE ESCAPEMENT FOR ALARMS.