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 105
small and as light aspossible and are connected by silk insulated cords to a vestpocket dry cell battery. 2,198 HAWKINS ELECTRICITY The public building outfits are connected with insulated wireslike telephones, the receivers being available to those whooccupy the seats and the one central… … SOUNDWAVES
Electrical engineering
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