Quartz Watch - The Secret Life of Machines - Video/DVD

Quartz Watch - 25 minutes The program begins with Hunkin describing the workings of sundial and water clocks. He cuts open a quartz watch to show what's inside. Then explains the principle of old clockwork clock - pendulum and escapement. Animation shows how Galileo noticed pendulum swing was always the same duration. A demonstration shows how a quartz crystal moves regularly when electric current is applied. Quartz under pressure produces spark. Piezo electric effect. Hunkin compares a tuning fork with a quartz crystal vibration. Liquid crystal display explained. Demo of how liguid crystal works between two sheets of glass - polaroid used - (see pic). A digital display of numbers 0, 1, 2 - 9 is made from 7 straight lines - demo. He shows how heat affects accuracy of quartz watch. And melts a quartz watch in the oven! Special notes

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	The Secret Life of Machines has been on TV around the world - USA, Australia, UK, Britain.... These award winning television programmes show how machines work. Using analogies, illustrations, working models and extraordinary experiments, Tim Hunkin 'lifts the bonnet' on the machines we take for granted. His enthusiasm for his subject is infectious. Excellent education and technology resources.
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