pdf 28 - Principles of Electricity Ch XIII, Apparatus and Circuits Popular
By Paul F 1637 downloads
28oct_PrincElect_ATT_ChXIII_Apparatus_Circuits.pdf
October 1928, "Principles of Electricity Applied to Telephone and Telegraph Work" extract includes pages 90 - 109 and the following sections:
76.The Telephone Receiver
77. The Telephone Transmitter
78. The Polarized Ringer
79. Plugs, Jacks and Cords
80. Resistances
81. Switchboard Keys
82. Relays
83. Operation of Toll Central Office Circuits in Establishing a Long Distance Connection - No. 1 Switchboard
Figure 168 - Typical Long Distance Terminating Connection. Open Wire Circuit - No. 1 Switchboard.
84.Operation of Toll Central Office Circuits in Establishing a Long Distance Connection - No. 3 Switchboard
Plate V - Toll Operating
Figure 168A - Typical Long Distance Terminating Connection. Four Wire Cable Circuit - No. 3 Switchboard.
Contributed by Steve Cichorsky.
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