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 26
resistance than the partially disconnectedtacks simply shunts the flow around them and theycease to be attracted. The magnetism is conceived to consist of a flow oflines of force as indicated in Figure 6. These linesare supposed to leave the magnet at the north pole X 22 Operating and Testing and… … Figure 5 we shall see it align itself to them and as it is broughtto the other end of the bar the other end of the needlewill meet it. The flow of these lines of force is greatlyfacilitated by iron or steel but there is no medium / /
Electrical engineering · Electric testing
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