What defines a capstan?

A capstan is defined as a revolving cylinder designed for winding rope or cable. This mechanical device is crucial in maritime operations as it allows for the controlled storage and tensioning of lines, particularly in tasks such as mooring and anchoring. The rotating action of the capstan makes it easier to apply significant force with less physical effort from the crew, which is especially important when handling heavy loads.

The design of the capstan ensures that ropes can be wound around it, utilizing friction to hold the line in place, which aids in pulling vessels into docks or adjusting their positioning while at anchor. This device exemplifies effective mechanical advantage in maritime contexts, enhancing safety and efficiency during operations.

Other choices, while related, do not accurately characterize a capstan. For instance, a horizontal support for ropes does not convey the function of winding or the revolving aspect, while an upright that assists in rope winding does not fully capture the specific functionality and design of a capstan. Similarly, a tool for navigating vessels is unrelated, as a capstan is not used for navigation but rather for handling ropes and cables.