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Plumping Mill

A corn crushing mill consisting of a MORTAR in which a PESTLE is repeatedly forcibly dropped to crush or crudely grind grain. (1) The PESTLE may be manually operated. (2) see SAPLING MILL. (3) The PESTLE may also be water powered. In this case, the PESTLE is attached to one end of a SWEEP (3), to the other end of which an open-topped box is attached. Water pouring into the box weighs it down, lifting the pestle (after the fashion of a see-saw) until the water tips out of the box. The pestle then descends into the mortar to crush the grain, and awaits the box refilling with water to repeat the cycle.