intro4

intro4 - Alarm Clock Pendulum Clock u Isochronous motion...

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Unformatted text preview: Alarm Clock Pendulum Clock u Isochronous motion (1583) u Vincenzo (1649) u Huygens (1675) & Robert Hooke u Galileo t Regulating hair spring Pendulum Clock Huygens (1675) u Regulating Giovani di Dondi (1364) spiral Electronic / Atomic u pico-second pico-second u Electronic t quartz crystal produces a constant current when excited t compressed to produce constant frequency u Atomic t Excitations of electrons in Caesium molecule 1 Caesium Atomic clock 2 ...
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