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n. Lay-torpedo. At Fort Fisher, larger torpedoes, connected in sets and designed to be fired by electricity, were arranged on the land face of the work. The wires leading to the majority of these were cut by fragments of shell during the bombardment, probably preventing considerable loss of life during the assault. Torpedoes buried in the ground and fired by a similar arrangement when trodden upon, and others connected by wires with electric batteries, were used in the defense of Sebastopol. Plan of fort Fisher, N. C., showing the part extending across the Isthmus, and the face protected by torpedoes. Fig. 6560 shows the northeast face of Fort Fisher, N. C., with the line of torpedoes, twenty-four in number, which were connected with the fort by three sets of double wires, each apparently intended to fire five or more torpedoes. The torpedoes were of three kind: shells, 13′ diameter; boiler-iron cylinders, 13″ diameter and 18° long; buoy-shaped sheet-iron cylinders of