Swiss made impulse movement as used by the Swiss Railways (Bundesbahn).br This one was fitted in a pilot dialbr Motor 48 Volts 50 Hzbr Impulse ± 24 Volts every minute, bipolair drive.br br The gearwheel in the middle drives the second hand. It has a clutch which allows it to slip when the pin latches with the pawl.br When the minute impulse activates the coil to advance the minute hand, the pawl moves to the left and the second hand is released again.