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 260
t has been once established by-pressing the push center, regardless of the fact that the lattermay be only momentarily held in the closed position. ELECTRIC BELLS 2,351 There are three types of continuous ringing bell, classifiedwith respect to the circuit maintaining device, as those with 1.… … Fig. 3,210.—Partrick and Wilkins outside bell cover; used for the protection of large bellswhen they are located in exposed places. Made suitably for use with skeleton bells from8 to 12 inches. Ans. It comprises a simple vibrating bell fitted with amechanical circuit maintainer and connections as…
Electrical engineering
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