Page:Nurse and spy in the Union Army.djvu/79

peculiar, being very short, but heavy. It is hoisted into a place fitted for it, outside of the lower hull, but within the impenetrable shield of the upper one. On the deck are but two structures rising above the surface, the pilot-house and turret. The pilot-house is forward, made of plates of iron, the whole about ten inches in thickness, and shot-proof Small slits and holes are cut through, to enable the pilot to see his course. The turret, which is apparently the main feature of the battery, is a round cylinder, twenty feet in interior diameter, and nine feet high. It is built entirely of iron plates, one inch in thickness, eight of them securely bolted together, one over another. Within this is a lining of one-inch iron, acting as a damper to deaden the effects of a concussion when struck by a ball—thus there is a shield of nine inches of iron. The turret rests on a bed-plate, or ring, of composition, which is fastened to the deck. To help support the weight, which is about a hundred tons, a vertical shaft, ten inches in diameter, is attached and fastened to the bulk-head. The top is made shot-proof by huge iron beams, and perforated to allow of ventilation. It has two circular port-holes, both on one side of the turret, three feet above the deck, and just large enough for the m.uzzle of the gun to be run out. The turret is made to revolve, being turned by a special engine. The operator within, by a rod connected with the engine, is enabled to turn it at pleasure. It can