...apacity and stability safely to carry and work a battery of two Xi-inch guns, . . the vessel and the two turrets and the pilot-house to be shot-proof against ordnance used in the naval service of the United States . The turrets, as they were called, were two oval casemates. The above comprises all that the contract calls for, so far as invulnerability is concerned, and no mention is made of her in this reg...