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 267
Fig. 207.—Selector frame. … Fig. 208.—Multiple bank. THE SYSTEM OF THE WESTERN ELECTRIC COMPANY 245 All are mounted on a carriage or frame which is clamped to the verticalbrush rod at the left, inside of which are the wires which carry the circuitsto the brushes. Normally the brushes are kept apart by the piece 35 which has…
Telephone
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