Page:Small-boat sailing; an explanation of the management of small yachts, half-decked and open sailing-boats of various rigs; sailing on sea and on river; cruising, etc (IA smallboatsailing01knig).pdf/55

 of one pound on the hauling part puts a strain of two pounds on the block.

The (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.

The (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 (Fig. 36) has the same power as the whip-upon-whip purchase. It has one single and one double block, the standing part