. Notes on torpedoes, offensive and defensive. her, and pressure is brought fco bear upon the India-rubber cylinders (g g, g g) and the India rubber ring orwasher (h.) These are thereby forced into all the intersticesin their vicinity, and everything becomes perfectly water-tight. The shoulder [i i) should be cast or welded on tothe case to contain the charge, so as to form one solid piecewith it. When the metal, of which the case for the chargeis composed, is iron, the screw (c c) must also be of iron;if any other metal, brass for example, were used in contactwith iron in sea-water, an electr
. Notes on torpedoes, offensive and defensive. her, and pressure is brought fco bear upon the India-rubber cylinders (g g, g g) and the India rubber ring orwasher (h.) These are thereby forced into all the intersticesin their vicinity, and everything becomes perfectly water-tight. The shoulder [i i) should be cast or welded on tothe case to contain the charge, so as to form one solid piecewith it. When the metal, of which the case for the chargeis composed, is iron, the screw (c c) must also be of iron;if any other metal, brass for example, were used in contactwith iron in sea-water, an electrical action would be imme-diately set up, and the iron would be very rapidly decora- 132 Apparatus foruse with a barrel. posed. This is an important point to remember in theconstruction of apparatus of this nature. Another similar form of apparatus has been designed byQuartermaster-Sergeant Mathieson, E. E., for carrying theconducting-wires into a charge placed in an ordinary woodenbarrel; this is shown in section in Fig. 50, and is precisely. similar in principle to that for the metal case, Fig. 49. Therebeing no iron here to decompose, the metal screws, &c, maybe formed of brass, which is an advantage, as this lattermetal is more easily worked in the form required; (a a) arethe two ebonite cylinders; (b) the brass coupling-screw; (c)a brass socket, in connection with another brass screw (d)within the barrel; (e e) are the ebonite tubes as before; (//) 133 India-rubber washers, and (g g) the insulated conducting-wires to connect the fuse. The screw (d) is furnished withspikes, which grip the inside of the barrel and secure rigid-ity. Another form of apparatus, somewhat similar to that Apparatus tordescribed in page 96, but an improvement thereon, has been wSefuse^ adesigned for use with a platinum-wire fuse and a metalcase for the charge; this is shown in section, Fig. 51; (a a)
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