Man's physical universe

xanabras

UNIT VII

SECTION 5

ELECTROMAGNETIC INDUCTION MADE POSSIBLE THE

PRACTICAL GENERATION, TRANSMISSION, AND UTILI-

ZATION OF CURRENT ELECTRICITY

The philosopher should be a man willing to listen to every suggestion, but

determined to judge for himself. He should not be biased by appearance;

have no favorite hypothesis; be of no school; and in doctrine have no master.

He should not be a respecter of persons but of things. Truth should be his

primary' object. If to these qualities be added industry, he may indeed hope

to walk within the veil of the temple of nature. — Faraday.

Introduction.

Michael Faraday (1791-1867) was the first man to visualize and

name the magnetic Hues of force. His studies led him to wonder why

magnetism should not produce electricity, inasmuch as electricity

Fig. 245.

A diagram of Faraday's discovery.

produces magnetism. The induction of electrical charges by other

static charges of electricity suggested the possibility of inducing a

current of electricity by use of the current from chemical cells. Faraday

wound two coils of insulated wire on the same iron ring and passed a

steady current through one coil, while he observed that no deflection

was produced in a galvanometer attached to the other coil. He

observed, however, that a slight deflection of the galvanometer occurred

when the current was started or stopped. This observation was

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