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block and tackle
The definition of block and tackle is a series of pulleys.
(noun)An example of a block and tackle is a method of hoisting up heavy blocks of metal using cables and pulleys.
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See block and tackle in Webster's New World College Dictionary
an arrangement of one or more pulley blocks, with rope or cables, providing significant mechanical advantage for pulling or hoisting large, heavy objects
See block and tackle in American Heritage Dictionary 4
noun
An apparatus of pulley blocks and ropes or cables used for hauling and hoisting heavy objects.
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block and tackle
Half the pull (p) is required to lift the weight (w) with a two single-block and tackle unit.
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