Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 25
the place of the Fuller bichromatecell where primary battery cells are required. The u common battery system11 is now universal and practically doesaway with the use of primary batteries. The direct current requiredfor the talking and for the switchboard indicating signals is obtainedfrom storage…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
