Crystal Palace International Electric Exhibition 1881-82

HER MAJESTY’S GOVERNMENT. røar Office. N.B.—The Exhibits of Her Majesty’s Government are numbered inde- pendently of the rest of the Catalogue ; each Catalogue Number corresponding to that affixed to the Exhibit. SPECIAL STORES USED IN SUBMARINE MINING. [1.] Mine moored to float near surface; holds 1001b. of gun- cotton ; is fired by electric current from the shore when struck by a hostile vessel, the contact of the ship being electrically notified in the firing station on shore. [2, 3, 4.] Other patterns of the same. [5.] Wooden Buoy containing circuit-closing arrangement, which acts in the same manner as No. 1, but the charge is contained in a mine moored below. [6.] Another pattern of the same in iron, in which the buoyancy is obtained in the iron case. [7.] Mine moored on the bottom of a river or harbour; holds 250 lb. of guncotton; is fired by electric current from the shore, either when an enemy’s ship strikes the buoy No. 5 or No. 6 over it, or when the ship is observed to be nearly over the mine., [8, 9.] Larger patterns, to contain 500 lb. of guncotton, for use in deeper water. [10, 11.] Still larger patterns, giving sufficient buoyancy to float the mines up to the best depth for effect in very deep water. Can be used as ground mines also. [12, 13, 14, 15, 16.] Sinkers, or mooring weights, for foregoing mines.