Vaccuum Cleaner - The Secret Life of Machines - Video/DVD

Vaccuum Cleaner - 25 minutes Hunkin doing what he loves starts this program - showing how early use of compressed air proved unsatisfactory for cleaning - blew the dust everywhere! Sucking through cloth was best - demo. Early industrial examples are shown with animation and archive film. Hoover invented domestic machine - it used a beater action plus suction. Then the cylinder type with internal bag was invented. Demonstration of variety of inventions - illustrating principle of suction. Demo of electromagnet as solenoid. Home made electric motor works to show principles. Pressure effect of air. Dirt bag operates by passing air - but trapping dirt particles. Demonstration (see pic - orange gas goes through, but dirt stays behind.) A fun program. 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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