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 330
—The principles of composite telegraphy havebeen applied to automatic dialing over toll lines. Figure 258 shows theessential principles. It is not necessary to give here a description of the LONG DISTANCE AND SUBURBAN EQUIPMENT 305 laws upon which composite rests. The retardation coils and… … C.Q-2 Retard^ « con yi^i L.R-4
Telephone
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