There
are three stokeholds, and to ventilate them and supply sufficient air
for the furnaces there is in each a 6 foot fan driven by an
independent engine running at 250 revolutions. These have been
supplied by Messrs. W.H. Allen & Co., London. The boilers are of steel
and adapted for a working pressure of 160 lb. to the square inch. They
are 16 feet in diameter and 18 feet long, and there are eight furnaces
in each boiler, sixteen in all, the diameter of each furnace being 3
feet 41/2 inches.
The cylinders of the main engines are 22 in., 36 in., and 57 in. in
diameter respectively, with a piston stroke of 3 ft. The high-pressure
cylinders are each fitted with a piston valve, and the intermediate
and low-pressure cylinders with double-ported slide valves, all of
which are worked by the usual double eccentric and link motion valve
gear, by which the cut-off can be varied as required. All the shafting
is forged of Siemens-Martin mild steel of the best quality, each of
the three separate cranks being built up. The condensers are placed at
the outsides of the engine room, and the air, feed, and bilge pumps
are between the engines and the condensers and worked by levers from
the low-pressure engine crosshead.
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