Electrical Telegraphy, Electric Bells and Telephones
2
1 votes
April 30, 1931
11m
Overview
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.
Directed by
Where to watch
In United States
Not available to stream, rent, or buy in United States right now.
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