A winch is a mechanical device that is used to pull in or let out or otherwise adjust the tension of a rope or wire rope.
Front of a MAN-based fire engine with a built-in winch, e.g. for towing damaged cars after an accident
Winch used on a fishing boat to bring in nets
Winching a car onto a tow truck
Glider winch. Winch spool can be seen on the side of the truck, while cables to the right of the image are attached to the glider(s) being launched
A capstan is a vertical-axled rotating machine developed for use on sailing ships to multiply the pulling force of sailors when hauling ropes, cables, and hawsers. The principle is similar to that of
Winch
…on ships accumulated wire or rope on the drum; those that do not accumulate, and instead pass on the wire/rope (see yacht photo above), are called capstans. Despite this, sailboat capstans are most often referred to as winches. Winches are the basis of such machines as tow trucks, steam shovels and elevators…
Tourists turn a capstan. The tensioned portion of the rope would fasten the ship to the quay, hoist a foresail, lift a spar into position on the mast or be used to transfer cargo to or from a dock or lighter.
Diagram of Ruston Proctor Steam Capstan, 1883