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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International Titles

Denshin Denrei Denwa Trailer

International Releases Dates

Japan 30 April 1931

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