Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 247
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… … isFigure 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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