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Insailing, ablock is a single or multiplepulley. One or a number ofsheaves are enclosed in an assembly betweencheeks orchocks. In use, a block is fixed to the end of a line, to aspar, or to a surface. A line (rope) isreeved through the sheaves, and maybe through one or more matching blocks at some far end, to make up atackle.
Thepurchase of a tackle refers to itsmechanical advantage. In general the more sheaves in the blocks that make up a tackle, the higher its mechanical advantage. The matter is slightly complicated by the fact that every tackle has aworking end where the final run of rope leaves the last sheave. More mechanical advantage can be obtained if this end is attached to the moving load rather than the fixed end of the tackle.
There are various types of blocks that are used in sailing. Some blocks are used to increase mechanical advantage and others are used simply to change the direction of a line. Aratchet block turns freely when a line is pulled in one direction but does not turn the other direction, although the line may slip past the sheave. This kind of block makes a loaded line easier to hold by hand, and is sometimes used on smaller boats for lines like main and jib sheets that are frequently adjusted.
A single, large, sail-powered warship in the mid-19th century required more than 1,400 blocks of various kinds.[1]
