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 335
ect the receiver across the line in series with a 2 m.f.condenser. It enables the subscriber to listen without interfering withwhatever dialing may be going on. If the line proves to be free, thesubscriber presses the hook release, the lever then rises to the full extentof its stroke, connecting… … Fig. 261.—Local battery automatic telephone circuit. Rural lines are often served by the regular lineswitch boards if there isnothing special to their operation. But if the number of such lines isconsiderable, or the conditions of their operation differ greatly from thoseof other lines, they will…
Telephone
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