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Poster Electrical Telegraphy, Electric Bells and Telephones 1931

Electrical Telegraphy, Electric Bells and Telephones 1931

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Watch Electrical Telegraphy, Electric Bells and Telephones (1931) : Full Movie Online Free 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.

  • Released: Apr 30, 1931
  • Runtime: 11 minutes
  • Genre:
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  • Production Company:

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