Defn: A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion. Specif., a bar of metal, wood, or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is three kinds, according as either the fulcrum F, the weight W, or the power P. respectively, is situated between the other two, as in the figures.
2. (Mach.) (a) A bar, as a capstan bar, applied to a rotatory piece to turn it. (b) An arm on a rock shaft, to give motion to the shaft or to obtain motion from it. Compound lever, a machine consisting of two or more levers acting upon each other. — Lever escapement. See Escapement. — Lever jack. See Jack, n., 5. — Lever watch, a watch having a vibrating lever to connect the action of the escape wheel with that of the balance. Universal lever, a machine formed by a combination of a lever with the wheel and axle, in such a manner as to convert the reciprocating motion of the lever into a continued rectilinear motion of some body to which the power is applied.
LEVERAGE
Lev"er*age, n.
Defn: The action of a lever; mechanical advantage gained by the lever. Leverage of a couple (Mech.), the perpendicular distance between the lines of action of two forces which act in parallel and opposite directions. — Leverage of a force, the perpendicular distance from the line in which a force acts upon a body to a point about which the body may be supposed to turn.
LEVERET
Lev"er*et, n. Etym: [F. levraut, dim. of lièvre hare, L. lepus. Cf.
Leporine.] (Zoöl.)
Defn: A hare in the first year of its age.
LEVEROCK
Lev"er*ock, n. Etym: [See Lark.]
Defn: A lark. [Scot.]
LEVERWOOD
Lev"er*wood`, n. (Bot.)
Defn: The American hop hornbeam (Ostrya Virginica), a small tree with very tough wood.