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Electrical Telegraphy, Electric Bells and Telephones · Full Movie
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Electrical Telegraphy, Electric Bells and Telephones
電信 電鈴 電話
★ 8.2Movie1 episodes1931
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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