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Synchronome switch clock
Designed in 1895 by Frank Hope-Jones, the Synchronome switch was widely used in master clocks and also was the basis of the slave pendulum in the Shortt-Synchronome free pendulum clock. A gathering arm attached to the pedulum moves a 15-tooth count wheel one step per cycle, with a pawl preventing movement in the reverse direction. The wheel has a vane attached which, once per 30-second turn, releases the gravity arm. When the gravity arm falls it pushes against a pallet attached directly to the pendulum, giving it a push. Once the arm has fallen, it makes an electrical contact which resets the gravity arm and acts as the half minuite impulse for the slave clocks.