The boat is described as a submarine moni tor. She is 30ft long, with 7jit depth of hold and B£ft beam. The lines of the lower half of the hull are not unlike those of other boats. Tho deck ha 3 -a Eloping surface. The boat is constructed of iron and steel. The pilot looks out from a dome one foot high and liiti. in diameter, with narrow slot lights on each side through which he can see in all directions. This dome is well for ward ; near ths stern is the turret hatchway, the only entrance into the vessel. Horizontal rudders on the sides near the stern cause the boat to ascend and descend at the will of the pilot, and a com mon rudder back of tbe screw guides her laterally. Water tanks that can be Ailed and emptied in short order lower and raise the monitor vertically without the use of the rudder. By a chemical device the air in tfie hold may be pariiied, and Professor J. H. L. Tuck, the inventor of the boat, claims that the crew might remain in her for several days without a freah supply. Pipes to store compressed air, however, are provided for ordinal y use.
