A close detail view of steel pulley wheels bolted to the roof inside the Ropery building in Chatham Dockyard.

A close detail view of steel pulley wheels bolted to the roof inside the Ropery in Chatham Dockyard. There are three pulleys, each with a single steel wire rope, and they are hooked onto ring bolts in a girder. The ceiling is lined and in the background is an old iron shaft with pulley wheels firmly fixed to it. The photographer is looking up at the pulleys.