Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 685
e commonbattery, B, furnishes current for all ringing and talking. At each stationthere is an ordinary receiver, microphone transmitter, and vibrating bell.There is only one bell in circuit when a call is made so that each bell musthave a vibrator. It makes no difference upon what button the… … Fig. 52. Ness Automatic Switch. An example of a device obviating this trouble is the Ness automaticswitch, illustrated by Fig. 52, arranged so that the replacing of the re-ceiver upon the hook causes the switch to fly back to its home position.In the engraving S is the lever of the selective…
Electrical engineering
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