(of a steam pump) having the steam pistons connected directly to the pump pistons without a crankshaft or flywheel.
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How to use direct-acting in a sentence
Each engine was reversed by a Brown type of direct-acting steam and hydraulic engine.Loss of the Steamship 'Titanic' | British Government
A vastly simpler form of pumping-engine without fly-wheel is the now common “direct-acting steam-pump.”A History of the Growth of the Steam-Engine | Robert H. Thurston
In larger vessels, as in yachts, in nearly all cases, the ordinary screw-engine is direct-acting.A History of the Growth of the Steam-Engine | Robert H. Thurston
In driers the direct acting engine has many advantages over the belt.
We may have the engine direct acting as above, or the power may be brought on by belting.