. American telephone practice . FIG. 187.—KELLOGG COMBINED DROP AND JACK lifts this spring, B, out of contact with the spring, E, with which itnormally engages, and as this spring rides upon the tip of the plugits forwardly projecting portion engages the drop, thus restoringit to its normal position. The entire electromagnet of the drop may be removed from theboard indepndently of the jack and the jack may also be removedindependently of the drop. One of the line terminals is formed by a rearwardly projecting 204 AMERICAN TELEPHONE PRACTICE. lug which is a part of the casting of the frame, B,
. American telephone practice . FIG. 187.—KELLOGG COMBINED DROP AND JACK lifts this spring, B, out of contact with the spring, E, with which itnormally engages, and as this spring rides upon the tip of the plugits forwardly projecting portion engages the drop, thus restoringit to its normal position. The entire electromagnet of the drop may be removed from theboard indepndently of the jack and the jack may also be removedindependently of the drop. One of the line terminals is formed by a rearwardly projecting 204 AMERICAN TELEPHONE PRACTICE. lug which is a part of the casting of the frame, B, while the otherterminal is formed by a similar lug, /, fastened directly on the linespring, D. The drop coil is connected between one of the line ter-minals and the spring, E, so as to be cut out of circuit by the insertion of the plug. Five of these combined jacks and drops are usually mounted onthe common plate, C, as shown in Fig. 188. The front of this plateis covered by a heavy hard rubber strip serving as part of the in
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
