A lever ( /ˈlɛvər/ or /ˈliːvər/) is a machine consisting of a beam or rigid rod pivoted at a fixed hinge, or fulcrum. It is one of the six simple machines identified by Renaissance scientists. The word comes from the French lever, "to raise", cf. a levant. A lever amplifies an input force to provide a greater output force, which is said to provide leverage. The ratio of the output force to the input force is the ideal mechanical advantage of the lever.
Read more about Lever: Early Use, Force and Levers, Classes of Levers, Law of The Lever
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Famous quotes containing the word lever:
“There is an inner world; and a spiritual faculty of discerning it with absolute clearness, nay, with the most minute and brilliant distinctness. But it is part of our earthly lot that it is the outer world, in which we are encased, which is the lever that brings that spiritual faculty into play.”
—E.T.A.W. (Ernst Theodor Amadeus Wilhelm)
“Och, Dublin City, there is no doubtin’,
Bates every city upon the say;
‘Tis there you’ll see O’Connell spoutin’,
An’ Lady Morgan makin’ tay;
For ‘tis the capital of the finest nation,
Wid charmin’ pisintry on a fruitful sod,
Fightin’ like divils for conciliation
An’ hatin’ each other for the love of God.”
—Charles James Lever (1809–1872)
“Now William pulled the lever down,
And click-clack went the printing-press.
William was the only printer in town
Who had peeped while the angels undress.”
—Allen Tate (1899–1979)