. Notes on torpedoes, offensive and defensive. contact to be damaged by theelectrical action set up by thesea-water, the coupling-screwand outer portions of this jointmay be made of gun-metal,which gives greater strengththan ebonite. Mathieson s is decidedly the MkSESSPjointbest °f a11 the temporaryjoints described, possessing,as it does, excellent insulatingqualities, great facilities formaking or detaching a con-nection between two cablesin a short s^ace of time, andbeing capable of standing a considerable tensile strain. Inmany situations it may conveniently be used to supply theplace of a
. Notes on torpedoes, offensive and defensive. contact to be damaged by theelectrical action set up by thesea-water, the coupling-screwand outer portions of this jointmay be made of gun-metal,which gives greater strengththan ebonite. Mathieson s is decidedly the MkSESSPjointbest °f a11 the temporaryjoints described, possessing,as it does, excellent insulatingqualities, great facilities formaking or detaching a con-nection between two cablesin a short s^ace of time, andbeing capable of standing a considerable tensile strain. Inmany situations it may conveniently be used to supply theplace of a permanent insulated joint, to which, as far asinsulating qualities are concerned, it is quite equal, and towhich, where facilities for examination are required, it issuperior. All the temporary joints, above described, were testedfor insulation, similarly to Dents, (see page 144,) and allstood the test, which was a very severe one, remarkablywell. Mathiesons was again more severely tested, asalready described, with very satisfactory Experiments totest temporaryjoints. CHAPTER IX. SUBMERGING MINES, ETC. We now come to the mode of laying down the mines insnch a position that they shall be most effective, and at thesame time so disposed that the explosion of one shall notinjure the cables, circuit-closers, &c, in its vicinity. The position of the mines having been first determined, ti0^o?miLsP°sishould be marked off by means of buoys, arranged to corre-spond with the charges to be subsequently placed in position,and points on shore to guide the vessels employed in layingthem. The moorings may either be first placed in position,and the mines and circuit-closers hauled down to them, or thewhole (moorings, mines, and circuit-closers) may be launchedoverboard, attached together in proper relative position, atthe same time. In deep water it would probably be foundpreferable to adopt a system of hauling down to mooringspreviously i^laced, while in shallow water it would, und
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