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.

SERIES 1:  vacuum cleaner sewing machine central heating system washing machine refrigerator television 

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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