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 269
hown partly elevated,revealing the perforated strap by means of which the elevating rolls liftand lower tin rod. The connection between the flat strap and the roundrod is somewhat flexible. The long, narrow slots in the strap are to holdthe rod in its operated position—there is in the elevator a… … Fig. 211.—Selector frame, details of control mechanism. clears the strap by very little space, and is running all the time. Themagnet 19 pulls levers 24 and 18 so as to cause roller 16 to press the strapagainst the up-roll. The detent which holds the brush rod in the operatedposition is marked 25…
Telephone
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