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 69
Figure 49 in two and the wires laid out flat. W, W representsthe commutator sections and N, S, the poles as inFigure 49. … Figure 50 A view of a finished armature is given in Figure 51. Alternating currents to be available for lighting purposes must have quite a high frequency; 60 cycles 68 Operating and Testing per second or 7200 alternations per minute beingabout the lowest frequency that can be used for arcor…
Electrical engineering · Electric testing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer01inte-108-32.webp)
