link motion
noun
a mechanism controlling the valves of a steam engine, consisting of a slotted link terminating in a pair of eccentrics
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for link motion
Historical Examples of link motion
Stephenson's link-motion valve-gear is used on most locomotives.
The Story of Great InventionsElmer Ellsworth Burns
Mr. Baldwin's characteristic reply was, "Then they shall have link-motion hereafter."
Illustrated Catalogue of LocomotivesM. Baird, et. al..