4 to 7) which are capable of developing 600 indicated horse
power, and whose cylinders are 19 inches and 34 inches in diameter with
a stroke of 2 feet. The condensers form part of the engine frame, and
have guide faces cast on for the crosshead shoes. They are fitted with
gun metal tube-plates, and each contain 516 tubes, 3/4 inch in diameter,
which have an exposed length of 6 feet 5 inches, and give a total
cooling surface of 650 square feet. The air and circulating pumps are
bolted to the back of the condensers, and are worked by levers from the
engine crosshead. Each engine has one feed and one bilge pump attached
to the air pump, and worked by the same lever. The plan of the engines
shows the pump arrangement very completely.
[Illustration: ENGINES AND BOILERS OF THE NEW STEAMSHIP CHURCHILL.]
The steam is supplied by two circular return tube boilers, 9 feet 6
inches in diameter and 10 feet long, with two furnaces in each. The
boilers, which are of steel throughout, except the tubes, are placed
longitudinally, and are fitted with two pairs of the Martyn-Roberts
patent safety valves.
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