The Secret Life of the Quartz Watch
All clocks and watches work by 'counting' some event which takes a fixed period of time, like the swings of a pendulum. The higher it goes the stronger the pull of gravity and the faster it comes back - so the swings always take a fixed time. The Quartz crystal in a watch vibrates at a fixed speed in a similar way.
heating system washing
SERIES 2: car internal combustion engine quartz watch telephone radio set video recorder
SERIES 3: fax machine lift word processor electric light photocopier the office
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