Capstan (nautical)

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 to transfer cargo to or from a dock or lighter.

A capstan is a vertical-axled rotating machine developed for use on sailing ships to multiply the pulling force of seamen when hauling ropes, cables, and hawsers. The principle is similar to that of the windlass, which has a horizontal axle.

Capstan
Anchor windlass
The capstan and the anchor windlass on the deck below that it drives. On-board the museum sailing ship Balclutha