Electrical Telegraphy, Electric Bells and Telephones Trailer

Electrical Telegraphy, Electric Bells and Telephones Trailer (1931)

30 April 1931 Animated 11 mins

When copper wire is wrapped around an iron rod and connected to a battery, it becomes an electromagnet. A science teaching material movie that explains the principle and structure of electric bells and telephones by applying the principle of an electromagnet through a fusion of live action and animation.

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Denshin Denrei Denwa Trailer

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