Tap"pet (?), n. Mach.

A lever or projection moved by some other piece, as a cam, or intended to tap or touch something else, with a view to produce change or regulate motion.

G. Francis.

Tappet motion, a valve motion worked by tappets from a reciprocating part, without an eccentric or cam, -- used in steam pumps, etc.

 

© Webster 1913.

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