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.
Director
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Sign inOriginal Name電信 電鈴 電話 (Electrical Telegraphy, Electric Bells and Telephones)
StatusReleased: 94 years ago
April 30, 1931
LanguageUnknown
Spoken LanguagesUnknown
Budget-
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