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# Long description

There are four sectional drawings of the engine arranged from left to right. Each view shows a piston moving inside a vertical cylinder. It is attached by a connecting rod to a rotating crankshaft at the bottom of the picture. The crankshaft is shown rotating in a clockwise direction. At the top of the cylinder there is a spark plug. At the top left of the cylinder is an inlet port opened and closed by an inlet valve. There is also an exhaust port opened and closed by an exhaust valve.