Alarm Clock - PowerPoint PPT Presentation
Title:
Alarm Clock
Description:
OVERVIEW Author: Glen Besterfield Last modified by: Glen Besterfield Created Date: 1/11/1995 1:02:36 AM ... Electronic / Atomic Caesium Atomic clock ... – PowerPoint PPT presentation
Number of Views:161
Avg rating:3.0/5.0
Title: Alarm Clock
1
Alarm Clock
2
Pendulum Clock
- Isochronous motion
- Galileo (1583)
- Vincenzo (1649)
- Huygens (1675) Robert Hooke
- Regulating hair spring
3
Pendulum Clock
4
Huygens (1675)
- Regulating spiral
5
Giovani di Dondi (1364)
6
Electronic / Atomic
- pico-second
- Electronic
- quartz crystal produces a constant current when
excited - compressed to produce constant frequency
- Atomic
- Excitations of electrons in Caesium molecule
7
Caesium Atomic clock
