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Reciprocating Engines: Two Reciprocating Engines driving the wing propellers were of the four-crank triple expansion type. Each weighed approximately 990 tons each. Each set had four inverted, direct-acting cylinders and high pressure having a diameter of 54 inches, the intermediate pressure of 84 inches, and each of the two low pressure cylinders of 97 inches., all with a stroke of 6 feet 3 inches.

The valves of the high pressure and intermediate cylinders were of the piston type, and thoe low-pressue cylinder had double ported slide valves, fitted with Stephenson link motion. Each engine was reversed by a Brown’s type of direct-acting steam and hydraulic engine. There were also a separate steam-driven high pressure pump fitted for operating either or both of the reversing engines. This alternative arrange was a stand-by in case of breakdown of the steam pipes to the engines.

A low pressure turbine was of the Parson’s reaction type, directly coupled to the center line of shafting and arranged for driving in ahead direction only. It was exhausted by two condensers, placed one on each side of it. A shut off valve was fitted in each of the eduction pipes leading off to the condensers. An emergency governor was fitted to shut down steam to the turbine, and simultaneously change over the exhaust from the reciprocating engines to the condensers, should the turbine speed become excessive through the breaking of a shaft or some other form of accident.

Boilers: All the boilers were 15 feet 9 inches in diameter, the 24 double ended boilers being 20 feet long and the single ended 11 feet 9 inches long. Each double ended boiler had six and each single ended boiler had three furnaces, with a total heating surface of 144,142 sq. ft. and a grate surface of 3,466 sq. ft. The boilers were constructed to the Board of Trade regulations and had a working draught of 215 lb. Per square inch.

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