What is the term for a vertically aligned cylinder used for pulling ropes?

A capstan is a vertical, rotating cylinder that is designed for winding ropes, cables, or chains. It often features a horizontal drum that allows for the effective management and control of heavy loads or anchor lines in various marine and nautical applications. The operation involves the rope being wrapped around the capstan, allowing it to be tightened or loosened as needed, primarily through manual or mechanical means.

Capstans are particularly valuable because they allow for significant tension to be applied without the risk of the rope slipping, making them ideal for tasks such as mooring or anchoring vessels. Their design facilitates efficient rope management, offering both strength and stability in demanding situations. This is what distinguishes a capstan from other devices such as winches, which may not have a vertical alignment and can be operated differently. Understanding the function and application of a capstan is crucial for handling various operational tasks in maritime environments.