HORSE is also a thick rope, extended in a perpendicular direction near the fore or after-side of a mast, for the purpose of hoisting or extending some sail upon it. When it is fixed before a mast, it is calculated for the use of a sail called the square-sail, whose yard being attached to the horse, by means of a traveller, or bull's eye, which slides up and down occasionally, is retained in a steady position, either when the sail is set, or whilst it is hoisting or lowering. When the horse is placed abaft or behind a mast, it is intended for the try-sail of a snow, and is accordingly very rarely fixed in this position, except in those sloops of war which occasionally assume the form of snows, in order to deceive the enemy.