Valve with Lap of Steam Engine at Extreme Left with Exhaust Ports Open

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“Since the valve must move a distance equal to the outside lap before admission can take place, it is evident that the eccentric can no longer be at right angles to the crank at the beginning of the stroke, but must be ahead of the right—angle point by an amount equal to AOC.” —Derr, 1911


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


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