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American telephone practice (1905)

Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 564

An illustration from American telephone practice, 1905, leaf 564
o raise the contact springs. In the blockshown the relays are alternately line and cut-off. Fig. 393 showsthe front and Fig. 394 the rear of siach block of relays, the latterfigure making clearer the arrangement of the various terminals.These relays, as will be seen, are not in themselves dust… … ^M-i FIG. 395.—STROMBEEG-CARLSOR RELAY. The Stroiiiberg-Carlson Company are using a relay almost iden-tical in design with the majoi type of Kellogg relay, the only dif-ference being that they provide an adjustable iron screw on thelower end of the armature by means of which the air gap may…

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