Left: a modern internal combustion engine, showing a steel cylinder with an intake valve and discharge valve. Right: an 1654 cylinder and wooden piston from the Guericke engine.
In engineering, cylinder is the tube-shaped container, typically sealed at one end, either with or without intake and out-take ports or valves, into which the adjustable piston fits, in the so-called piston and cylinder engine.

External links
‚óŹ Cylinder (engine) – Wikipedia.

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