Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity (1905)
American School (Chicago, Ill.) · Chicago : American School of Correspondence · leaf 348
nd pole changers are a reproduction ofthose shown in connection with the polar duplex. At the left hand, or Pittsburg, end the dynamo switch hasbeen omitted for the sake of simplicity; everything, in fact, hasbeen left out except the parts needed to illustrate the fundamental 315 86 THE ELECTRIC…
Electrical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
