[1] 152-millimeter cannon [2] Flame protection [3] 120-millimeter cannon [4] Officers' accommodation [5] Aft torpedo room [6] Cellular compartments (used as storage) to limit the effects of damage on the waterline (flooding) [7] Balanced rudder [8] Screw propeller [9] Steering system [10] Manual steering system [11] Air compressors [12] Auxiliary engines for steering system [13] Officers' room [14] Searchlight's platform [15] Commander's accommodation [16] Aft kitchen [17] Cellars [18] Ammunition depots for secondary armament [19] Engine room [20] Torpedo nets (furled) [21] Booms of torpedo nets [22] Aft bridge [23] Davits for boats [24] Funnel's lining [25] Gangway [26] Armored turret [27] Armor plate protection [28] Aft boiler room [29] False bottom [30] Bilge [31] Engine room [32] Driving axle [33] Feeding water pumps [34] Coal depots [35] Ammunition depot for main armament [36] Ammunition's elevator [37] Steam machinery for turret control [38] Rotatory platform [39] Cannon's elevator [40] Slider [41] Ramrod [42] Loader for projectiles and charges [43] 432-millimeter cannons [44] Access duct to gangway and foretop [45] Foretop [46] Machine gun [47] Room for ammunition disarming [48] Fore boiler room [49] Smoke duct [50] Command bridge [51] Navigation platform [52] Non-commissioned officers' accommodation [53] Crew's accommodation [54] Crew's area [55] Capstan [56] Fore kitchen [57] Supports for hammocks [58] Crane's engine [59] Access area [60] Safety door to prevent water from entering the lower area [61] Foodstuffs' storage [62] Lubricants' depot [63] Capstan's engine [64] Water for feeding the boilers [65] Filter pumps which depurate marine water for feeding the boilers [66] Armored deck [67] Armored belt [68] Wooden shock absorber [69] Crane for heavy weights [70] Awning (furled) [71] Cables and ropes [72] Torpedo depot [73] Fore torpedo room [74] Prow [75] Spur

In 1862 an Italian steam corvette, built with an iron hull, entered service; she was armed with sixteen 160-millimeter cannons installed in batteries at each side of the hull, as in the sailing warships. The increase in size of naval cannons rendered necessary to reduce their number; because of that, between 1865 and 1885 they were designed ships with central batteries, in which the armament was concentrated in the armored area in the center of the hull, and ships with turrets diagonally disposed. The Andrea Doria was the last Italian battleship equipped with turrets arranged in diagonal (in the Italian ships the starboard turret was always placed further forward than the larboard one, unlike in the British counterparts). She belonged to the Roger di Lauria class, of which they were part as well the Francesco Morosino and the Ruggiero di Lauria. As the previous Duilio and Dandolo, these ships had an armored belt in the central area, but their hull was made of steel instead of iron, and their turrets of new model mounted breech-loading cannons instead of muzzle-loading ones. While the Andrea Doria was being completed, the design of capital ships was changing: the main armament was being reallocated to the fore and aft decks. The battleship Sardegna, built following such layout, entered service four years after the Andrea Doria.

Specifications of Andrea Doria ironclad battleship

Displacement
Normal: 11204 tonnes
Dimensions
Length: 105.9 meters (347 feet 5.28 inches)
Beam: 19.8 meters (64 feet 11.52 inches)
Draught: 8.4 meters (27 feet 6.6 inches)
Armor
Lower main belts: 450 millimeters (17.71 inches) x 50 meters (164 feet 0.5 inches)
Upper main belts: 450 millimeters (17.71 inches) x 28 meters (91 feet 10.35 inches)
Bulkheads: 360 millimeters (14.17 inches)
Propulsion
Boilers: 8
Steam double-expansion engines: 2 x 5150 horsepower
Speed
Maximum: 16 knots (29.6 kilometers/hour)
Range
Maximum: 7240 kilometers (3909 nautical miles) with 850 tonnes of coal
Armament
4 x 431-millimeter 108-ton Armstrong cannon
2 x 152-millimeter cannon
4 x 120-millimeter cannon
2 x 75-millimeter cannon
10 x 57-millimeter cannon
17 x 37-millimeter quick-firing cannon
5 x underwater torpedo tube
Complement
17 officers and 489 petty officers and mariners

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