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 100
Figs. 3,036 to 3,039.—Views showing various parts of a magneto switchboard. 1,2 and 3,lamps, used in connection with the transfer circuit; 4, jacks, or sockets into which theoperators plugs are inserted; 5, drops, used as a clearing out signal on the cord circuits,that is, to provide a means for… … tch boardJumper ^ \^ S/ ^W Protector Distributing RingFig. 3,040.—Various parts of Western Electric No. 1,420 or No. 1,430 distributing frame. irrespective of whether the night alarm key be operated or not, orwhether or not a drop or signal be thrown. 109. Ringing key wire broken or the outside…
Electrical engineering
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