Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 120
k contact which corresponds to thelevel which is busy and on which the vertical wiper rests when the linewipers stand opposite that level. The vertical wiper VW is connected to negative battery through the500-ohm winding of the vertical relay YRy. This is the vertical testingcircuit. When the… … RmglntrSfarfFig. 85.—Circuit of 1-digit group connertor. the circuit for the vertical magnet, and grounds a wire known as therelease-relay ground RlRyGrd. While the subscriber is letting the dial rotate back on the digit, theline relay vibrates and sends impulses to the vertical magnet through…
Telephone
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