The Boulting machine sieves the meal. There are two sorts of boulter at Sarehole: one uses a wire mesh and the other uses a wooden frame with a piece of cloth wound around it to form a cylinder. The cloth is missing now, but it probably was a material like muslin which would allow the fine flour to pass through but catch the larger particles of bran. The boulter works on the same principle as a washing machine when it is spinning the water out of the clothes. Theses machines are driven by a leather belt that is connected to a pulley, which is driven by water wheel.