. The railroad and engineering journal . patterns, the idea in them all beingto produce simultaneous rupture at two different points inthe same circuit. The cut-off used in our own service isa low-tension fuse, identical in construction with that usedto fire mines, except that the detonating cap is omitted,and the priming chamber closed with a plug. This fuseforms part of the electrical circuit leading to the mine, andis enclosed in a water-tight box, so that when ruptured theshore end of the cable becomes insulated. When themine is exploded the bridges of both the mine and the cut-off fuse, b
. The railroad and engineering journal . patterns, the idea in them all beingto produce simultaneous rupture at two different points inthe same circuit. The cut-off used in our own service isa low-tension fuse, identical in construction with that usedto fire mines, except that the detonating cap is omitted,and the priming chamber closed with a plug. This fuseforms part of the electrical circuit leading to the mine, andis enclosed in a water-tight box, so that when ruptured theshore end of the cable becomes insulated. When themine is exploded the bridges of both the mine and the cut-off fuse, being alike in all respects, are simultaneouslyruptured—it being understood that the current must bestrong enough to fuse the platinum bridges. In the Eng-lish service one cut-off, much like our own, is used, andin another the wire is mechanically broken by using a bitof gun-cotton in the cut-off case. The cut-off may beplaced in a water-tight case of its own and anchored nearthe junction-boxes, but a better arrangement is to place it. within the junction-box. Fig. 20 shows how this may bedone. The cut represents a circular junction-box forseven cables, a a a being the individual mine cables, bthe multiple cable leading to the firing station, and c c cthe cut-off fuses. The manner of securing the cables isby means of a collar and turks-head, as shown.(to be continued.) THE CHIGNECTO SHIP RAILROAD. The ship railroad may be said to have its first germ inthis country, in the inclined planes built many years agoon the Morris Canal in New Jersey, on which the canalboats were floated into a cage or crib running upon wheelsand hoisted up the inclined plane to the higher level ofthe canal, the power used in most cases being the over-flow of water from the upper level. This plan containedreally the essential idea of the ship railroad, and in latertimes engineers have developed the idea and proposed itsapplication in a number of cases. Notable among thesewas the plan of the lae Captain
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
