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Knob and Tube - early electrical insulation

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Published on Mar 12, 2013

In the time of Thomas Edison we used pocelain insulators "knob and tube" system. Rick DeLair shows us a working model with cleats, tubes and a 100+ year old light bulb with switch. John Harnden explains the influence of Czech pottery makers (Cermak Family) on development of insulators.

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