ACR-10 Tennessee / CA-10 Memphis - Armament
The battery power was greatly increased, by the substitution of four 10-inch guns in place of four 8-inch guns on the Maryland class, and adding two 6-inch guns to the fourteen on the Maryland class. Both the Tennessee class and the preceeding Pennsylvania class were 504 feet long, with the Tennessee having a beam of 72 feet, versus 69 feet on the Pennsylvania. The normal displacement of the Tennessee class was 14,500 tons, an increase of 6 per cent over that of the Pennsylvania class of six vessels built at 13,680 tons. Certain features of the new designs permitted this increase to be almost wholly devoted to armament and armor, thereby producing, at slight additional cost, very much greater military power. The addition to the weight of guns and ammunition carried amounted to 29.7 per cent over that on the Pennsylvania class, and produced an increase in the weight of one discharge of the battery amounting to 47.4 per cent.
The secondary battery was twenty-two 3-inch rapid-fire guns, twelve 3-pounder semi-automatic guns, two 1-pounder automatic guns, two 1-pounder rapid-fire guns, two 3-inch field pieces, two machine guns of 3O-caliber and six automatic guns of 30-caliber. This battery was more powerful than that of any similar vessel in the world.
The 10-inch guns were mounted in two eliptical, balanced turrets located within cylindrical barbettes, extending from the protective deck, to well above the main deck, and turning through arcs of 270 degrees. The 6-inch guns were mounted, four in independent, armored casemates on the main deck, the remainder in broadside on the gun deck, all on pedestal mounts, the back and side plates of the casemates on main deck being of 2-inch nickel steel. At each end of the vessel, four of the 6-inch guns can be trained directly ahead or directly astern, so that it is possible to obtain a direct ahead fire with the main battery of two io-inch and four 6-inch guns, and the same number at the stern. All of the 6-inch guns can be trained through a complete angle of about 115 degrees each. The 6-inch guns are so arranged that the muzzles are trained inside the line of side armor, thus leaving the side clear and unobstructed while going alongside a dock or vessel, or when coaling.
The 3-inch guns were mounted as follows: Six on sponsons on the gun deck, six in broadside on the gun deck, and ten in broadside on the main deck. Arrangements were made for quickly and conveniently dismounting the 3-inch guns in broadside. The 3-pounders and smaller guns are mounted on the upper deck, bridges, in the tops, and wherever they can secure the most commanding positions, to be ready at all times for repelling torpedo boat attacks and for inflicting damage upon the unprotected portion of an enemy's ship.
The ammunition and shell rooms were so arranged that about one-half the total supply of ammunition will be carried at each end of the ship. The remaining ammunition was stowed where it can readily be whipped up by hand, when time is available, from the lower to the upper platform.ammunition conveyors. Provision was made by means of power hoists, to handle the 6-inch and 3-inch and 3-pounder ammunition, at the rate of seven pieces a minute. In addition to the power supply, there has been provided sufficient means for a supplementary supply of ammunition by hand, to interfere as little as possible with the power handling, so that, with the combined means of supply, it will be possible to supply ammunition to all of the guns at a rate equal to that at which they can be fired.
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