Elementary telegraphy : a manual for students; written specially to meet the requirements of the ordinary grade of the subject as published in the syllabus of the city and guilds of London Institute (1910)
Pendry, H. W. (Henry Walter) · London ; New York : Whittaker & Co. · leaf 195
At the centraloffice a double battery of 80 volts with 500 in each lead isjoined to a transmitter, G-terminal key, Wheatstone receiver,and differential galvanometer to rheostat and line. Afterleaving the galvanometer the line path is through a non-polarized relay in the local circuit of which the… … current, at the out station, passes through S.C. galvanometer,a 500 resistance coil, one winding of the Wheatstonereceiver, and thence via bridge of key and its back stop TELEGRAPH SYSTEMS 185 to earth. No local battery is i-equired on the receiver,owing to the provision of a 4500 polarized sounder…
Telegraph
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