 It runs at 5 beats (ticks) per second, and is equipped with a tiny 7 1/2 second remontoire.A balance-brake, activated by the position of the fusee, stops the watch half an hour before it is completely run down, in order that the remontoire does not run down also.Temperature compensation is in the form of a 'compensation curb' (or 'Thermometer Kirb' as Harrison called it).