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Lever, simplest type of machine, consisting of a rigid beam supported at a stationary point (the fulcrum) so that a force applied to one point of the beam can shift a load at another point. There are 3 classes of lever: those with the fulcrum between the effort and the load; those with the load between the fulcrum and the effort; and those with the effort between the fulcrum and the load.

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21st Century Webster's Family Encyclopedia21st Century Webster's Family Encyclopedia - Lange, Dorothea to Lilac