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 268
Figs. 3,223 and 3,224.—Holzer-Cabot bells. Fig. 3,223 plain vibrating skeleton frame bell;fig. 3,224 water tight bell for marine service and outdoor use in places where water anddampness are prevalent. It is made for 6 to 220 volt circuits without external resist-ance. This bell is of the vertical…
Electrical engineering
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