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 283
Fig. 3,255.—Edwards electro-mechanical weather proof gong for exposed places. Entirelyenclosed and gives 350 blows to each winding. This gong can be used either on open orclosed circuits and can be arranged to operate as a single stroke or continuous ringinggong, or to ring continuously until run…
Electrical engineering
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