. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . 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 rotating) and the selectors areconstructed to find an idle line among twenty lines. Compressed Air. Fig. 188.—Christensen pneumatic selector moving. Figure 185 is a view of the selectors from below, and Fig. 186
. Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems . 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 rotating) and the selectors areconstructed to find an idle line among twenty lines. Compressed Air. 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)
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttelephone, bookyear19
