. The railroad and engineering journal . :Starting at the fuse in the mine-case one terminal is put toground through the anchoring gear, the other passes to thejunction-box a through the disconnector-fuse to the multi-ple cable b, thence to station B. Here the wires are sep-arated, pass over the key-board, and then, in one or twomultiple cables, to station A, where the wires are againseparated, passing over the key-board at the firing-stationto the firing-battery and to ground. As thus connected up there will be, under ordinary cir-cumstances, two breaks in each electrical circuit—at thekey-bo
. The railroad and engineering journal . :Starting at the fuse in the mine-case one terminal is put toground through the anchoring gear, the other passes to thejunction-box a through the disconnector-fuse to the multi-ple cable b, thence to station B. Here the wires are sep-arated, pass over the key-board, and then, in one or twomultiple cables, to station A, where the wires are againseparated, passing over the key-board at the firing-stationto the firing-battery and to ground. As thus connected up there will be, under ordinary cir-cumstances, two breaks in each electrical circuit—at thekey-boards of the stations A and B—which must be closedbefore the mine can b? fired, Suppose a vessel to be Vol. LXV. No. 4.] ENGINEERING JOURNAL. 169 approaching the mine-field, as upon the line B I. The ob-server at B, the instant it passes upon thai line, puts downhis key, closing the break at his station and leaving onlythat at A. Should the vessel hold its course, the observerat A, when it arrives upon the line ^ i, or over mine 1, puts down his key, the circuit is closed and the minefired. If approaching, as atj, both keys would go down si-multaneously when the vessel arrived over mine No. 8. With such an arrangement as above indicated, therewould always be the possibility that the observers at thetwo stations might be following different vessels whenmore than one was approaching the mine-field, and so fail-ure to explode the mines result. This difficulty can be ob-viated by an arrangement by which the observer at B cancause a signal corresponding to each individual mine tooperate at the firing-station so long as a vessel remainsupon its line, leaving the final act of firing the mines withthe observer at that station. Electrical communicationmust, of course, be maintained between the two sta-tions. When the mines are upon a single line, as shown in , the firing arrangements are very simple. At the firing-station A are the electrical batteries and a firing arc ar-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectrailroa, bookyear1887
