Telephone - The Secret Life of Machines - Video/DVD

Telephone - 25 minutes Hunkin rips a phone to pieces - shows how it's basically a microphone and an earpiece - demonstrates it working across a long wire. A demo shows that electricity flow causes a magnetic field. Archive film and animation are used to show morse code used for early messages. Demo of varying electric current moving a diaphragm - how varying mechanical movement creates varying electric current. Two speakers are connected in a simple demo - microphone to receiver demo. Experiment - carbon granules in a coffee jar lid. Mechanical telephone exchanges using electromechanical devices. Solid state switching experiment. Portable phones. Early cell phones are shown. Telephone technology has advanced amazingly in the last few years! 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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