Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 331
cross each other, thelink is said to be with crossed rods. The difference of action in the two cases shows itself in thelead, which increases when the link is shifted from the full to the mid gears. The following are other forms of link-motion which are applied to locomotives in Europe: TheGooch… … of which is pivoted with the valve-stem. The curvature of the link faces the valve-rod, and its radiusis the length of the rod. Hence it follows that the block can be shifted without producing anychange in the position of the valve, admitting thus a constant lead. The Allen link-motion is the…
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