WINDAGE, the difference between the diameter of a piece of artillery, and the diameter of the shot or shell corresponding thereto. See Cannon and Mortar.
WINDING a Call, the act of blowing or piping upon a boatswain’s whistle, so as to communicate the necessary orders of hoisting, heaving, belaying, slackening, &c. See the article Call.
Winding-Tackle, a name usually given to a tackle formed of three fixed and two or three moveable sheaves. It is principally employed to hoist up any weighty materials into or out of a ship, in the exercises of lading and delivering. See Tackle.
WINDLASS, vindas, a machine used in merchant-ships to heave up the anchors from the bottom, &c.
The windlass is a large cylindrical piece of timber, fig. 15. plate [XII]. formed on the principles of the axis in peritrochio. It is supported at the two ends by two frames of wood, a, b, placed on the opposite sides of the deck near the fore-mast, called knight-heads, and is turned about in this position as upon an axis, by levers called handspecs, which are for this purpose thrust into holes bored through the body of the machine. See the article Heaving.
The lower part of the windlass is usually about a foot above the deck. It is, like the capstern, furnished with strong pauls, c, d, to prevent it from turning backwards by the effort of the cable, when charged with the weight of the anchor, or strained by the violent jerking of the ship in a tempestuous sea. The pauls, which are formed of wood or iron, fall into notches, cut in the surface of the windlass, and lined with plates of iron. Each of the pauls being accordingly hung over a particular part of the windlass, falls eight times into the notches at every revolution of the machine, because there are eight notches placed on its circumference under the pauls. So if the windlass is twenty inches in diameter, and purchases five feet of the cable at every revolution, it will be prevented from turning back, or losing any part thereof, at every seven inches nearly, which is heaved in upon its surface.
As this machine is heaved about in a vertical direction, it is evident that the effort of an equal number of men acting upon it will be much more powerful than on the capstern; because their whole weight and strength are applied more readily to the end of the lever employed to turn it about. Whereas, in the horizontal movement of the capstern, the exertion of their force is considerably diminished. It requires, however, some dexterity and address to manage the handspec to the greatest advantage; and to perform this the sailors must all rise at once upon the windlass, and, fixing their bars therein, give a sudden jerk at the same instant, in which movement they are regulated by a sort of song or howl pronounced by one of their number.
The most dextrous managers of the handspec in heaving at the windlass are generally supposed the colliers of Northumberland: and of all European mariners, the Dutch are certainly the most aukward and sluggish in this manœuvre.
WINDSAIL, a sort of wide tube or funnel of canvas, employed to convey a stream of fresh air downward into the lower apartments of a ship.
This machine is usually extended by large hoops situated in different parts of its height. It is let down perpendicularly through the hatches, being expanded at the lower end like the base of a cone; and having its upper part open on the side which is placed to windward, so as to receive the full current of the wind; which, entering the cavity, fills the tube, and rushes downwards into the lower regions of the ship. There are generally three or four of these in our capital ships of war, which, together with the ventilators, contribute greatly to preserve the health of the crew.