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 71
ds it until another call is initiated. When the double dogdisengages it, the shaft rotates back to its original angle, under theinfluence of the clock spring and there drops downto its normal position by the force of gravity.The drawing in Fig. 54 of the shaft with itswipers shows more clearly the… … Fig. 51.—Automatic relay mounting, top view.
Telephone
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