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 119
Figure 78 are dark, the polarities of the dynamos are correct forparallel operation. In lieu of the lamps the test can be made by insert-ing one wire from each pole of the dynamo into a cupof water and noting the bubbles that form. If thepolarity is correct the bubbles will form at the samepole of…
Electrical engineering · Electric testing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
