Demonstration of the Great Electric Induction Coil at the Polytechnic Institution in London in 1869 by Professor Pepper. Viewed by a large number of visitors to the Polytechnic, including the Princesses Louise and Beatrice, the coil was over 3 metres long and able to produce sparks up to 76 centimetres long.
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TOP23728984
Source:
達志影像
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RM
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