. Notes on torpedoes, offensive and defensive. rat (b) would not under such circumstances press down hiskey, she would pass on to the second line (nh n2l &c7) and 188 having passed safely through the interval of the first linewould stand a good chance of coming within striking dis-tance of one of the mines of the second. For this secondline (wi, w2, &c.) a similar but separate arrangement shouldbe by a pre- A simplification of this plan may occasionally be adoptedat one station?113 by employing a preconcerted signal at the point (a) whenthe bow of a vessel came on the line (a m
. Notes on torpedoes, offensive and defensive. rat (b) would not under such circumstances press down hiskey, she would pass on to the second line (nh n2l &c7) and 188 having passed safely through the interval of the first linewould stand a good chance of coming within striking dis-tance of one of the mines of the second. For this secondline (wi, w2, &c.) a similar but separate arrangement shouldbe by a pre- A simplification of this plan may occasionally be adoptedat one station?113 by employing a preconcerted signal at the point (a) whenthe bow of a vessel came on the line (a m^) For instance,if, when the bow of the vessel (s) arrived on the line (a m3j)a flag were raised at the point (a,) the observer at(ft) wouldinstantly notice whether she was on any of the lines ofsight passing over his mines, and if she were, would atonce press down the key corresponding therewith, as Eo. 3,shown in the Fig. 79. Directly she had passed the line (a mu)the flag at (a) should be dropped, as she would then be safe Figt c % so far. as that line was concerned. This latter systemrequires great coolness and nerve on the part of the obser-ver at (&,) as he has two things to do, viz, to watch the ves-sel passing across his intersections, and to be on the alertto receive the signal from (a.) In such a case it has been 189 found best to employ two men at station (/;,) one exclusivelyto watch the station (a,) and on the flag being- raised togive the word fire,7 and on the flag being dropped to givethe word u stop, the second man would keep his eye on thevessel, and be ready to fire the right mine at the rightmoment. A separate signal-flag and firing arrangementwould, as before, be required for the next line (^ n& &c.)of mines. /j\ % 80. / i \
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1872
