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 309
,301 shows a roll of in-sulating tape. 2,400 HAWKINS ELECTRICITY Current Supply for Bell Ringing.—Dry cells are generallyused for a battery source of electrical supply with which to ringbells of the vibrating type. While there is not much economyin restoring them after they have become weak, it is…
Electrical engineering
Internet Archive · Brigham Young University · Public Domain Mark 1.0. Free to use for anything.
