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of one pound on the hauling part puts a strain of two pounds on the block.
The Whip-upon-Whip Purchase (Fig. 34) is employed for the preventer backstays on small cutters. A pull of one pound on the hauling part exerts a force of four pounds at the upper block.
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Fig. 33.
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Fig. 34.
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Fig. 35.
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Fig. 36.
The Gun-Tackle Purchase (Fig. 35) has two single blocks with the standing part of the rope made fast to the upper block. A pull of one pound on the hauling part exerts a force of three pounds at the upper block. This purchase can be employed for bowsprit shrouds, main tack tricing line, etc.
A Luff-Tackle Purchase (Fig. 36) has the same power as the whip-upon-whip purchase. It has one single and one double block, the standing part
