Electricians' operating and testing manual; a hand book for men in charge of electrical apparatus, repair men, trouble men, lamp trimmers, and electricians generally (1916)
Horstmann, Henry Charles, Tousley, Victor Hugo, 1875- joint author · Chicago, F.J. Drake & co · leaf 251
of force in which the linesof force emanate from the north pole, and encirclingthe needle enter at the south pole. As the earth itselfis surrounded by lines of force extending from thenorth pole to the south pole, the compass needle beingfree to move tends to set itself in a north and… … Figure 150 ant field. By means of Amperes rule, which is givenbelow, the direction of the current flow can be easilydetermined. Amperes rule : If a person swims with the currentand looks at a north seeking pole it will be deflected tothe left. The relation existing between a wire carry-ing current…
Electrical engineering · Electric testing
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