in Navigation, an assemblage of several breadths of canvas sewed together by the lifts, and edged round with cord, fastened to the yards of a ship, to make it drive before the wind. See SHIP.

The edges of the cloths, or pieces, of which a sail is composed, are generally sewed together with a double seam; and the whole is skirted round at the edges with a cord, called the bolt-rope.

Although the form of sails is extremely different, they are all nevertheless triangular or quadrilateral figures; or, in other words, their surfaces are contained either between three or four sides.

The former of these are sometimes spread by a yard, as lateen-sails; and otherwise by a stay, as stay-sails; or by a mast, as shoulder-of-mutton sails; in all which cases the foremost leech or edge is attached to the said yard, mast, or stay, throughout its whole length. The latter, or those which are four-sided, are either extended by yards, as the principal sails of a ship; or by yards and booms, as the studding-sails, drivers, ring-tails, and all those sails which are set occasionally; or by gaffs and booms, as the main-sails of floops and brigantines.

The principal sails of a ship (fig. 1.) are the courses or lower sails a; the top-falls b, which are next in order above the courses; and the top-gallant sails c, which are expanded above the top-falls.

The courses are the main-fall, fore-fall, and mizen, main stay-fall, fore stay-fall, and mizen stay-fall; but more particularly the three first. The main stay-fall is rarely used except in small vessels.

In all quadrangular sails the upper edge is called the head; the sides or skirts are called leeches; and the bottom or lower edge is termed the foot. If the head is parallel to the foot, the two low corners are denominated cluers, and the upper corners earings.

In all triangular sails, and in those four-sided sails wherein the head is not parallel to the foot, the foremost corner at the foot is called the tack, and the after lower-corner the clue; the foremost perpendicular or flopping edge is called the fore-leech, and the hindmost the after-leech.

The heads of all four-sided sails, and the fore-leeches of lateen-sails, are attached to their respective yard or gaff by a number of small cords called ro-bands; and the extremities are tied to the yard-arms, or to the peak of the gaff, by earings.

The stay-falls are extended upon stays between the masts, whereon they are drawn up or down occasionally, as a curtain slides upon its rod, and their lower parts are stretched out by a tack and fleet. The clues of a top-fall are drawn out to the extremities of the lower yard, by two large ropes called the top-fall fleets; and the clues of the top-gallant sails are in like manner extended upon the top-fall yard-arms, as exhibited by fig. 2.

The studding-sails are set beyond the leeches or skirts of the main-fall and fore-fall, or of the top-falls or top-gallant sails of a ship. Their upper and lower edges are accordingly extended by poles run out beyond the extremities of the yards for this purpose. Those sails, however, are only let in favourable winds and moderate weather.

All sails derive their name from the mast, yard, or stay, upon which they are extended. Thus the principal sail extended upon the main-mast is called the main-fall, d; the next above, which stands upon the main-top mast, is termed the main-top fall, e; and the highest, which is spread across the main-top-gallant mast, is named the main-top-gallant fall, f.

In the same manner there is the fore-fall, g; the fore-top fall, h; and the fore-top-gallant fall, i; the mizen, k; the mizen-top fall, l; and mizen-top-gallant fall, m. Thus also there is the main-stay fall, o; main top-mast stay-fall, p; and main-top-gallant stay-fall, q; with a middle stay-fall which stands between the two last.

N.B. All these stay-falls are between the main and fore-masts.

The stay-falls between the main-mast and mizen-mast are the mizen stay-fall, r; and the mizen top-mast stay-fall, s; and sometimes a mizen top-gallant stay-fall above the latter.

The stay-falls between the foremast and the bowsprit are the fore stay-fall, t; the fore top-mast stay-fall SARCOPHAGUS of Alexander the Great. and the jib, x. There is besides two square sails extended by yards under the bow-sprit, one of which is called the sprit-fail, y; and the other the sprit-fall top-fail, z.

The fludding-fails being extended upon the different yards of the main-mast and fore-mast, are likewise named according to their stations, the lower, top-mast, or top-gallant fludding fails.

The ropes by which the lower yards of a ship are hoisted up to their proper height on the masts, are called the jears. In all other fails the ropes employed for this purpose are called haliards.

The principal sails are then expanded by haliards, sheets, and bowlines; except the courses, which are always stretched out below by a tack and sheet. They are drawn up together, or trifled up, by bunt-lines, cluc-lines, d; leech-lines, e; reef-tackles, f; flab-line, g; and spiling-lines. As the bunt-lines and leech-lines pass on the other side of the sail, they are expressed by the dotted lines in the figure.

The courses, top-fails, and top-gallant fails, are wheeled about the mast, so as to suit the various directions of the wind, by braces. The higher fludding-fails, and in general all the stay-fails, are drawn down, so as to be furled, or taken in, by down-hauls.

Some experienced fail-makers contend, that it would be of much advantage if many of the fails of ships were made of equal magnitude; in which case, when necessity required it, they could be interchangeably used. For example, as the mizen top-fail is now made nearly as large as the main top-gallant fail, it would be easy to make the yards, masts, and fails, so as mutually to suit each other. The main and fore-top fails differ about two feet at head and foot, and from one to three feet in depth. These likewise could be easily made alike, and in some cases they are so. The same may be said of the main and fore top-gallant fails, and of the mizen top-gallant fail, and main fore-royal. The main-fail and fore-fail might also, with respect to their head, be made alike; but as the former has a gore at the leech, and a larger gore at the foot for clearing it of the gallows, boats, &c. which the latter has not, there might be more difficulty in arranging them. The difficulty, however, appears not to be insurmountable. These alterations, it is thought, would be extremely useful in the event of losing fails by fires of weather. Fewer fails would be thus necessary, less room would be required to stow them, and there would be less danger of confusion in taking them out. But perhaps the utility of these alterations will be more felt in the merchant-service than in the navy, which latter has always a large store of spare fails, and sufficient room to stow them in order. Thus, too, spare yards and masts might be considerably reduced in number, and yet any casual damages more easily repaired at sea. Top-mast fludding fails are occasionally substituted for awnings, and might, by a very little attention in planning the rigging of a ship, be so contrived as to answer both purposes. See Ship-building.

Sail is also a name applied to any vessel seen at a distance under sail, and is equivalent to ship.

To let SAIL, is to unfurl and expand the sails upon their respective yards and stays, in order to begin the action of sailing.

To Make SAIL, is to spread an additional quantity of sail, so as to increase the ship's velocity.

To shorten SAIL, is to reduce or take in part of the sails, with an intention to diminish the ship's velocity.

To Strike SAIL, is to lower it suddenly. This is particularly used in saluting or doing homage to a superior force, or to one whom the law of nations acknowledges as superior in certain regions. Thus all foreign vessels strike to a British man of war in the British seas.