General Science : a book of Projects

Cover General Science : a book of Projects
General Science : a book of Projects
Edgar a Edgar Alden Bedford
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gap. Electric waves pass out into surrounding space from the antenna and cause similar electric waves in the antenna of the receiving station, which by means of pieces of ap- paratus called crystal detectors or audion detectors, are made susceptible of being detected by a telephone receiver.
Problem 6. How mechanical energy is changed into electrical energy by the dynamo. — In our discussion of Digitized by VjOOQ iC ELECTRICITY AND MODERN LIFE 263 Figure, 201. — A Simple Dynamo N, north pole of
... a permanent magnet.
S, south pole of a permanent magnet.
G, point of contact of brushes for carrying oxidation of fuel, the use of water power, etc., we under- stood that heat energy and mechanical energy may be trans- formed into electrical energy. This is done by the dynamo, a machine complicated in appearance, which, how- ever, in its simplest form is not difficult to under- stand.
You will rtcall that in the electric bell a current of electricity passing through the coil of wire, wound around a piece of current into outride circuit iron, caused the iron to become a magnet.


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