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 299
w of a switch unit (Fig. 238) the wiper shaft is at the left.The rotary ratchet wheel is pinned to the shaft and rotates and rises withit. The rotary detent is in the form of a long plate which holds the wheelno matter how high the shaft rises. The vertical ratchet rack is attachedto the shaft by… … Fig. 240.—Plan-view of 2-niotion switch. at the top, hides the rotary magnet. Below them is the vertical magnet.Further details of the switch are shown in the drawings of Figs. 239and 240. In these the banks are attached. The upper is the line bank,through which the telephone lines are connected.…
Telephone
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