290 STAFF COMMANDER EVANS AND MR. A. SMITH ON THE MAGNETIC 
and the only wood used in the hulls, with the exception of teak-wood backing to the 
armour plates, is for the surface covering of the iron decks, and for the personal 
arrangements and accommodation of the crews. 
In the Warrior, Black Prince, Defence, and Resistance, the armour-plating of 4^-inch 
iron is not continued to the bow or stem, but where it terminates is continued from side 
to side of the ship as an armour bulkhead. In the Achilles, Hector, and Valiant, the 
armour plating is continued round the ship, but of smaller dimensions near the bow and 
stern, and with corresponding smaller transverse-armour bulkheads. 
The Royal Oak, Prince Consort, Caledonia, and Ocean, of 4050 tons, 800 to 1000 
horse-power engines, and carrying thirty-five heavy guns, are types of the largest-sized 
wood-built iron plated-ships ; the hull, with the exception of the iron upper deck and 
its supporting iron beams and uprights, is entirely constructed of wood ; the exterior of 
the hull to 4 feet below the water-line (in this respect similar to the iron-built ships) is 
plated with 4|-inch iron entirely round. 
The Enterprise, of 993 tons, is the type of the smaller-sized wood-built ship ; she is 
constructed to carry four heavy guns within a square battery of 4^-inch iron, and has a 
continuous armour belt of 4|-inch iron round the ship ; the upper deck, deck beams, 
and top sides are of thin plate-iron. 
The Royal Sovereign, of 3765 tons, is an experimental class of vessel; she was origin- 
ally a wood-built three-decked ship of 110 guns, but now cut down to the lower-gun 
deck, plated continuously round with 5^-inch iron, and with an iron upper deck and 
bul works. The armament of five guns of large calibre is worked within four turrets ; 
the iron frame of these turrets varies in thickness from 5^ to 10 inches ; and the largest, 
arranged to carry two guns, weighs 146 tons. 
The internal arrangements of all these classes of ships allow little room for selection 
in the position of the compasses. The accurate drawings, kindly furnished by the 
Department of the Controller of the Navy, enables their several positions to he shown 
with reference to the most important masses of iron. 
