"The therapy is compleat!" Stubbs announced. The laborers gladly let go and stood up straight to stretch their tired backs, whilst keeping wary vigil on the crank-handle, which continued to rotate—its vis inertiae might break the jaw of an unwary man. After the drum had slowed to a low idling speed they seized the crank again and nudged it around a quarter-turn or so. It was now possible to see that the near face of the drum was fitted with a long narrow hatch nearly spanning the interval between hub and rim. The crank-men made sure that this was down and vertical, like an hour-hand at the stroke of six. Then they tromped down the stairs in quest of refreshment.