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The engine is passing out of the stage in which the fuel-made steam worked machinery, which, in its turn, worked propellers; and passing into the stage in which the latent forces of the fuel itself are brought to bear more directly on propellers, that is to say, into the stage of internal combustion engines and the turbine-driven screw.
In this case it is obvious that, by a suitable adjustment of the pitch of screw adopted in both cases, a nice mathematical agreement between the vapour power and the liquid application of that power can be ensured. All previous records of speed have been eclipsed by the turbine-driven steamers engined on this principle.
She was a twelve-hundred-ton, triple-screw, turbine-driven boat, and, thanks to the space-economy of the new system, her builders had been able to stow away fifteen thousand horse-power in her engine-room, and this when fully developed gave a speed in smooth water of thirty-five knots or a little over forty statute miles an hour.
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