D Valve

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“A valve for opening and closing the induction and eduction passages of a steam-engine cylinder: so called from its plan resembling the letter D. fig. 2 ... represents a section of a steam-cylinder and nozles.” -Whitney, 1911


William Dwight Whitney The Century Dictionary: An Encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1911)


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