twofold purchase

noun Machinery, Mechanics.

a purchase using a double standing block and a double running block so as to give a mechanical advantage of four or five, neglecting friction, depending on whether the hauling is on the standing block or the running block.

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Nearby words

two-wheeler, two-word verb, twoccing, twofer, twofold, twofold purchase, twolegged, twonie, twoonie, twopence, twopenny