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 230
Fig. 187.—Racks with Christensen pneumatic selectors mounted upon them. This selector, which belongs to the line switch type, differs from otherwell-known selectors both in its construction and in its method of opera- AUTOMATIC TRAFFIC DISTRIBUTOR EQUIPMENT 209 tion. The motion is rectilinear (not… … Fig. 188.—Christensen pneumatic selector moving. Figure 185 is a view of the selectors from below, and Fig. 186 is aview from above. For comparing the dimensions an ordinary slide ruleis shown. 1 1 1K(H)
Telephone
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