The tower itself was not a fit place for people to lodge. The Doctor gave Eliza a room in an adjoining house. Jack put the fear of God into all the rats he could find in her room, then climbed the stone stair that spiraled * up the inside of the tower. The tower did its part by moaning in wind-gusts like an empty jug when an idler blows over the top. From the windmill at the top a shaft, consisting of tree-trunks linked one to the next with collars and fittings hammered out of iron, dropped through the center of the tower to an engineering works on the dirt floor. The floor, then, was pierced by a large hole that was obviously the mouth of a mine-shaft. An endless chain of buckets had been rigged so that the windmill's power raised them up from the shaft laden with water. As they went round a giant pulley they emptied into a long wooden tray: a mill-race that carried the water out through a small arched portal in the tower wall. Then the empty buckets dove back into the shaft for another go-round. In this way water was drained away from some deep part of the mines that would normally be flooded. But up here, the water was a good thing to have. After gathering a bit of head in a system of trenches outside, it powered small mill-wheels that ran bellows and trip-hammers for the smiths, and finally collected in cisterns.