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 218
ne set. Self-acting Meter at Sub-station.—The self-acting meter (Fig. 178)appears like a cylinder with a window at which appear the numbers on theregister wheels. It requires four wires to connect it to the telephone set. The subscriber dials the number as usual. When the called stationanswers, the… … Fig. 178. occurs, the apparatus restores itself to normal. In so doing, the pawlturns the number wheel so as to record the call. In its normal condition the electromagnet is short circuited. Whenreceiving a call, the coil is therefore not in the circuit. If, however, thedial should be turned while…
Telephone
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
