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 25
which is to be magnetized as shown in Figure 7.Tf the inducing magnet is strong it is not even neces-sary to bring it in contact with the bar to be magnet-ized. One must proceed in a systematic manner, how-ever, that is, always touch the same end of the bar tobe magnetized with the same end of the… … Figure 7 Permanent magnets are often made up of a numberof bars of equal length and shape fastened togetherand are then known as compound magnets. Perma-nent magnets can be demagnetized by heating to a redheat. ELECTRO-MAGNETS Electro-magnets differ from permanent magnets;first, in being made of…
Electrical engineering · Electric testing
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