What does a Jacob's Ladder refer to on a ship?

A Jacob's Ladder on a ship refers specifically to a rope ladder with rungs that is rigged over the side. This type of ladder is typically used to allow crew members to board or disembark from the vessel when it is not at a dock or when the height of the ship's side makes direct access difficult. It is designed for safety and ease of use, featuring a robust construction to support the weight and movement of personnel.

The design of the ladder, with its rungs spaced apart and securely attached to the side of the ship, enables it to be easily climbed while providing a secure means of crossing the gap from a smaller boat or the water to the ship's deck. This is particularly important in operational scenarios where personnel need to quickly and safely transition to and from the ship.