. American telephone practice . The springs are platinum-pointed,as shown, the arrangement being such that when the hook is in itsraised position the spring, 4, presses 3, 2. and 1 together, leavingspring, 5, disconnected as shown. When, however, the hook islowered by the weight of the receiver, the springs, 1, 2, and 3,break contact with each other and with spring, 4, the latter makingcontact with spring, 5. The long spring, 4, is connected with oneside of the line, and serves to complete the talking circuits when thelever is raised, and the signaling circuit when the lever is
. American telephone practice . The springs are platinum-pointed,as shown, the arrangement being such that when the hook is in itsraised position the spring, 4, presses 3, 2. and 1 together, leavingspring, 5, disconnected as shown. When, however, the hook islowered by the weight of the receiver, the springs, 1, 2, and 3,break contact with each other and with spring, 4, the latter makingcontact with spring, 5. The long spring, 4, is connected with oneside of the line, and serves to complete the talking circuits when thelever is raised, and the signaling circuit when the lever is switch has a distinct advantage over most other types, inthat the lever itself and the restoring spring, 5. form no part of the LOCAL BATTERY SUB-STATION EQUIPMENT. 155 circuit, and, therefore, no provision has been made to prevent loosecontacts between them. The contact springs are all platinum-pointed, so that there is small liability of trouble. A strong pointin favor of this form of switch is the ease with which it may be. ^r FIG. 134.—KELLOGG HOOK SWITCH. adapted to meet the requirements of almost any circuit, it beingvery easy to add more springs or to so arrange them that theircontacts will be made and broken in a definite order upon the raisingor lowering of the hook.
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Keywords: ., boo, bookcentury1900, bookdecade1900, bookidamericantelepho00mill
