Large
Torpedo.
lbs.		Small
Torpedo.
lbs.
Glyoxilin4716
Schultze’s blasting powder6022
Compressed gun-cotton6022
Picric powders7326
Rifle grained powder7627
Horsley’s original8028
Horsley’s blasting powder8530
Nobel’s dynamite10035

The above must be considered an approximation, since much will depend upon the labour expended in packing the torpedo.

Some of the powders named have not yet been manufactured on a large scale.

The priming case is made of stout sheet copper, and contains a large bursting charge, which may be either rifle grained powder or a stronger explosive, which is recommended.

(D) Section.

(E)

In the centre of the priming case is a brass tube in which the exploding bolt works, and at the bottom of this tube is a steel-pointed pin, which pierces the capsule on the muzzle of the exploding bolt, when the bolt is forced down. At the side of the brass tube, and near the base of the pin, is a small hole, covered with thin brass foil, which will allow of an escape of water into the priming case, should any have collected at the bottom of the tube. The loading hole of the priming case is at the bottom of the case, and arranged with cork and cap upon the same principle as the loading holes for main charge. A powerful spanner is provided for screwing in the priming case and caps of main loading holes, which are fitted with leather washers to form a water-tight joint. The priming case can be stored separate from the torpedo if preferred, but there is no necessity for so doing unless it is charged with a dangerous compound. When the torpedoes are being stored, a wooden plug is inserted into the brass tube of the priming case; there is a cavity in the plug at the lower end; the cavity is filled with a greasy composition, into which runs the pin of the priming case when the ping is in its place; the pin is thus protected from corrosion, and the tube of the case secured from any foreign matter getting accidentally into it.