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fourfold purchase

a tackle that is composed of a rope passed through two fourfold blocks in such a way as to provide mechanical power in the ratio of 1 to 5 or 1 to 4, depending on whether hauling is done on the running or the standing block and without considering friction.
Compare tackle (def 2). Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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