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 204
LAMP TO GROUND ALTERNATINGGROUND DETECTORFOR TWO CIRCUITS … 1 ri r n n n 1 I 1 u J J 1 1 uu 1 JU ^ (5 LAMP TO GROUND <- 1 IF THE LAMP BURNS AGROUND IS INDICATED ONTHE OPPOSITE SIDE OF THECIRCUIT FROM THAT TOWHICH THE SWITCH ISCONNECTEDFig. 8.Connections of Ground Detectors. 180 ELECTRIC WIRING 29 •sary, depending upon the underground connections…
Electrical engineering
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
