Webster
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Webster’s Revised Unabridged Dictionary · 1913

Link motion

Link′ mo′tion (mō′shŭn). (Steam Engine) A valve gear, consisting of two eccentrics with their rods, giving motion to a slide valve by an adjustable connecting bar, called the link, in such a way that the motion of the engine can be reversed, or the cut-off varied, at will; — used very generally in locomotives and marine engines.

☞ The illustration shows a link motion for a vertical engine, c representing the shaft carrying two eccentrics, a and b, for making the engine run forward and backward, respectively, their rods e and d being jointed to opposite ends of the slotted link f, in the opening of which is a pin g which is attached to the valve rod h. The valve will receive the motion of the forward eccentric when the link is in the position shown, and the motion of the backward eccentric when the link is shifted so far to the right as to bring e in line with h, or a compound motion derived from both eccentrics when the link is shifted to intermediate positions, the compound motion causing the valve to cut off the steam at a point determined by the position to which the link may have been shifted.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty. Of the others, 1,362 (a word or a single letter each) were inferred by AI from the context by the dictionary’s own rules and are marked with a wavy underline (tap or point at one to see the note); the rest, which could not be inferred with confidence, are left as “?”.