. Electrical world. cal trial has proved all such suggestions tohave been faulty in conception. A new idea in this direction, whichappears encouraging, is disclosed in a patent issued to M. C. Rorty,of Dedham, Mass., and assigned to the American Telegraph & Tele-phone Company. The remodeled system contemplates the use ofthe drops and jacks, both answering and multiple, together withpractically all of the magneto system wiring associated with them—a great saving. The connecting cord circuits must, however, bereversed, although the keys and plugs are suitable for reuse. InFig. 2 is shown the rem
. Electrical world. cal trial has proved all such suggestions tohave been faulty in conception. A new idea in this direction, whichappears encouraging, is disclosed in a patent issued to M. C. Rorty,of Dedham, Mass., and assigned to the American Telegraph & Tele-phone Company. The remodeled system contemplates the use ofthe drops and jacks, both answering and multiple, together withpractically all of the magneto system wiring associated with them—a great saving. The connecting cord circuits must, however, bereversed, although the keys and plugs are suitable for reuse. InFig. 2 is shown the remodeled system in diagram, in which will FIG. I.—HOFFMAN CABLE CLIP. whole forms a .^ecure fastening. The method of using the clipswill be better understood from a glance at Fig. I than from any de-scription. The clip in the lower part of the figure is shown justready to hook over the messenger strand. REMODELING BRANCH TERMINAL SWITCHBOARDS. Before the advent of the common battery switchboard the most. FIG. 2.—RORTV SWITCH AND SIGNAL SYSTEM. be recognized at once the standard Bell common battery subscribersstation set, and the standard bridging line circuit. The only changesin this latter are the insertion of a battery and retardation coil inthe drop circuit. The battery, of course, causes the drop to fall assoon as the line circuit is closed by the release of the subscribershook switch. The retardation coil serves to balance inductively theeffect of the earthed line drop coil, which, as there is no cut-off de-vice, remains legged to ground at all times. The cord circuit isnovel only in the provision of a relay in the battery supply to therepeating coils, which, through its contacts, controls the supervisorylamps, so that these may glow only when the plugs are in the busy test is quite similar to that of the standard bridging switch-board. NEW APPARATUS. .An improvement in magneto bells has been made by A. M. Knud-son, which consists essentially in provid
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectelectri, bookyear1883
