The mizen-mast, instead of a lower square-sail like the two others, has a sail like that of a cutter, lying in the plane of the keel, its bottom stretched on a boom, which extends far over the taffarel, and the upper edge carried by a gaff or yard sloping upwards, supported by ropes from the top of the mizen-mast.
All these sails, the sky-sails excepted, have four sides, as have also the sprit-sails on the bowsprit, jib-boom, &c.; and all, except the sail last mentioned on the mizen, usually lie across the ship, or in planes forming considerable angles with the axis or central line of the ship. There are a number of sails which lie in the same plane with the keel, being attached to the various stays of the masts; these are triangular sails, and those are called stay-sails which are between the masts: those before the fore-mast, and connected with the bowsprit, are the fore stay-sail, the fore-topmast-stay-sail, the jib, sometimes a flying jib, and another called a middle jib, and there are two or three others used occasionally. Thus it appears that there are no less than fifty-three different sails, which are used at times, though, we believe, seldom more than twenty are set at one time, for it is obviously useless to extend or set a sail, if the wind is prevented from filling it by another which intercepts the current of air.
The higher the wind, the fewer the sails which a ship can carry; but as a certain number, or rather quantity, of canvas is necessary in different parts of the ship to allow of the vessel being steered, the principal sails, that is, the courses or lower sails, and the top-sails, admit of being reduced in extent by what is termed reefing: this is done by tying up the upper part of the sail to the yard by means of rows of strings called reef-points passing through the canvas; this reduces the depth of the sail, while its width is unaltered on the yard, which is therefore obliged to be lowered on the mast accordingly.
