Steam Engine Valve Centered with Piston

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“It is usual to put the engine on center before setting the valve. First put the engine in a position where the piston has nearly completed the outward stroke, and make a mark M on the guide opposite the corner of the crosshead or at some convenient place.” —Derr, 1911

Source

Derr, Louis Cyclopedia of Engineering (Chicago, IL: American Technical Society, 1911)

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