. Notes on torpedoes, offensive and defensive. construction of all instruments of thisnature. The mode in which the uneven succession of currents,produced by a magneto-induction apparatus, and which isnot given in the Course of Instruction in Military Engineering,is overcome is very ingenious. Sir Charles Wheatstone hasplaced two bobbins on each pole of the magnets instead ofone, by which arrangement he obtains the result shown inFig. 69, where, if (n n, s s) be tbebobbins, and (a) the armature revolv-ing in front of them, the latter is soarranged that, at the moment when itis breaking contact
. Notes on torpedoes, offensive and defensive. construction of all instruments of thisnature. The mode in which the uneven succession of currents,produced by a magneto-induction apparatus, and which isnot given in the Course of Instruction in Military Engineering,is overcome is very ingenious. Sir Charles Wheatstone hasplaced two bobbins on each pole of the magnets instead ofone, by which arrangement he obtains the result shown inFig. 69, where, if (n n, s s) be tbebobbins, and (a) the armature revolv-ing in front of them, the latter is soarranged that, at the moment when itis breaking contact with (n1) and («,) itshall be making contact with (n) and6-,) and thus the difficulty occasionedby the uneven succession of currents,which would occur if only one pair of bobbins were used, isgot over; for tbe coils are so arranged that, for example, inthe position of the armature shown, the larger or breaking-contact current, induced in the coils (n) and(s,) is transmittedin the same direction as the smaller or making-contact cur- Fig. 164 rent, induced in the coils (nf) and (.9,) and thus we obtain aneven succession of currents, iirst in one direction and thenin the opposite; for, as the armature continues to revolve, ittirst makes, and then breaks, contact with the opposite pairsof bobbins simultaneously and with great rapidity. The defect of this instrument is the small quantity of theelectrical current induced, which renders it necessary tohave very perfect insulation throughout the whole of of Fuses to be fired with this apparatus must be arranged instones exploder, simple divided circuit, and the number of charges, whichmay be fired in an^ given group, depends on the extent ofthe leakage or loss of current through the ends of the con-ducting-wires laid bare, after any given number of mines insuch group have been fired. Though practically simultane-ous, the charges are really fired in extremely rapid succession,and as each explodes a grea
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Keywords: ., bookcentury1800, bookdecade1870, bookpublisherwashi, bookyear1872
