The Millstones
There are three pairs of millstones. Each pair of millstones comprises a bedstone, which remains stationary, and a runner stone, which rotates above it. The runner stone is driven from below through gearing, and the grain is fed into the hole in its centre, known as the eye, from which it passes outwards, being ground between the faces of the stones. The stones weigh up to three-quarters of a ton each, so to lift them there is a stone crane which has curved iron arms which fit into holes on the edges of the stones.