_Experiment in England, 1874._--Target:--A rectangular iron case 20' long, 10' high, and 8' wide, divided into six compartments by means of one longitudinal bulkhead midway between the front and rear faces of the target, and two athwartship bulkheads equidistant from the ends of the target. Thickness of front and rear faces 11/16", of longitudinal bulkhead 1/4", of athwartship bulkheads 3/8". Torpedo:--100 lbs. of gunpowder, enclosed in a spar torpedo case and fired by two detonators. It was exploded in contact with the target, 7-1/2' below the surface of the water, and 7' from top of target. Effect of explosion on the target:--"Front of centre compartment destroyed and top blown off. Plate representing inner skin destroyed. Back of centre compartment (rear face of the target) much bulged, and penetrated; the hole measured 36' × 15". Large portions of the target were thrown to a height of 150 to 200 feet, and from 80 to 100 yards' distance." The effect of explosion on a ship's pinnace, which had been placed 16 feet from and at right angles to the front face of the target, with steam up, and canopy and shield in position, was that a large quantity of water was thrown back in the boat, putting the fires out, and filling the boat up to her thwarts, but otherwise the boat was uninjured. _Experiments at Copenhagen, Denmark, in 1874._--The object of these experiments was to ascertain if a ship's armoured side would be seriously injured by a torpedo exploded in contact with it. 1ST EXPERIMENT. Target:--1" thick, and 2' × 2', supported in a horizontal position on a substructure consisting of 8" timber resting on two pieces of 6" timber under two sides, and completely supported by earth up to lower edge of substructure. Torpedo:--33 lbs. of dynamite, enclosed in a square wooden case 2-1/4" high, and 5·5" × 5·5"; it was placed on the middle of the earth with 8" of earth tamping; this tamping representing the resistance of a thin stratum of water. Effect of explosion:--The plate was broken into four pieces, and substructure crushed. 2ND EXPERIMENT. Target:--2" thick, and 2' × 2-1/2', supported in a horizontal position on a substructure as above, but resting on four piles of 6" x 6" timber. Torpedo:--8·9 lbs. of dynamite, enclosed in a wooden case 4" high, and 5" × 10". It was laid with one edge on the plate, the other edge 3" above the plate; same tamping as above. Effect of explosion:--The plate broken into three pieces, and substructure crushed. 3RD EXPERIMENT. Target:--5" thick, and 3' 8" × 4' 7", supported in a horizontal position on a substructure as above, but eight piles of 6" × 6" timber used. Plate bolted to the structure with eights. Torpedo:--44·4 lbs. of dynamite, enclosed in a wooden case, of same thickness as the Harvey torpedo, and 4" × 13" × 21"; it was placed with surface against the plate, one edge 2" and the other 5-1/2" from the plate; tamping as before.