Assertion: locomotive's cylinder | /r/HasProperty | sealed by moving piston
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text: Boiler technology and construction in Watt's time allowed only for steam engines operating on the principle of low pressure boilers acting upon this pressure differential to a vacuum within a cylinder sealed by a moving piston, which caused piston to reciprocate within the cylinder, effecting a connected piston rod, which caused a lever to reciprocate and thus effect pumping via a bellows action (and relevant one-way flap-valves) or instead cause a crank to rotate continuously in one direction thus creating useful kinetic energy- transferred to factory, especially textile machinery, via belts.