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 63
cheme of master-switchcontrol of Keith lineswitches. 46 AUTOMATIC TELEPHONY mounted upon it, although one is disconnected and the master shafts areall placed under the control of the other by means of the connecting rodwith a turnbuckle at its center which links together the lower ends ofthe upper… … Fig. 44.—Keith lineswitch with an unwired bank. The switch jacks engage corresponding shelf-jack springs as shown inFig. 45, which gives a clearer view of a master switch and a few mountedlineswitches. The lineswitches in this illustration are of the two-spooltype. Lineswitch Circuits.—The circuit…
Telephone
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