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 115
, which very often breaks down theinsulation of the machine. The arc which follows theplug when it is suddenly withdrawn, is also often dan- Dynamo Operation—Direct Current 111 gerous to the operator. If, however, such a circuitmust be opened it should be done with a rapid motionand the operator… … Figure 76 current systems. Such machines are limited to con-stant potential w<Drk and variable currents. The con-nections of a shunt dynamo and switchboard areshown in Figure 76. The same general considerationsthat apply to arc machines also apply here. 112 Operating and Testing To start the…
Electrical engineering · Electric testing
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