A tackle comprising a rope rove through two single blocks with the standing part of the rope made fast to the strop of one of the blocks. It multiplies the power exerted on the fall of the tackle by three when rove to advantage. Its original use was to run out a gun after it had been loaded so that the muzzle projected through the gunport ready for firing, but being a useful tackle for many purposes it is still used afloat. See also purchase.
Subjects: Maritime History.