; and four low pressure cylinders, 80
in.; with a stroke of 4 ft. Each set of engines has an air pump 33 in.
in diameter and 2 ft. stroke, and a surface condenser having 12,800
tubes and an aggregate surface of 2250 square feet, the length of the
tubes between the tube plates being 9 ft. There is also in each
compartment one centrifugal circulating pump driven by a small
independent engine, of the diameter of 3 ft. 9 in., and capable of
pumping from the bilge as well as the sea. The screw propellers are 18
ft. 3 in. in diameter with a mean pitch of 24 ft. 6 in.
Steam is furnished by six main double-ended boilers, having four
furnaces at each end, and one auxiliary boiler, with a heating surface
of 900 sq. ft., the dimensions of the former being 15 ft. 2 in. by 18
ft., and of the latter 10 ft. by 9 ft. long. The total area of
firegrate surface is 863 sq. ft, and of heating surface 26.936 sq. ft.
Each engine room is kept cool by four 4 ft. 6 in. fans. Forced draught
is produced by twelve 5 ft.
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