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
Fig. 51.—Automatic relay mounting, top view. … Fig. 52.—Back of con-nector switch. by the designation O.N.S. When the shaft is in its normal position thesprings are in one condition. When the shaft is lifted one step, the fingerconnected to the shaft releases its pressure on the off-normal springs andallows them to perform whatever switching…
Telephone
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