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John Davidson
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13,853. Davidson, J. June 8. Cam gears.-In high - speed vertical engines, drop valves, piston valves, or combined drop and piston valves are actuated from the crank-shaft l either by an oscillating cam g, Fig. 1, or by a rotating cam k<1>, Fig. 4, which bears against a roller e under a plunger a carried by the valve-rod b. In the arrangement shown in Fig. 4, the upper valve may be operated from a link m.
GB191013853D1910-06-081910-06-08Improvements in Valve Gear for Steam Engines.
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