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 for Link motion
From The Collaborative International Dictionary of English v.0.48 :

  Link motion \Link" mo"tion\ (l[i^][ng]k" m[=o]"sh[u^]n) n.
     (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.
     [1913 Webster]
     Note: 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.
           [1913 Webster]

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