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holes posts were fitted, which carried two bars, so that the stone was made to revolve by horse or man power, like the arrangement of a capstan.

The hole or eye of the nether stone was for the purpose of receiving a conical plug, the apex of which penetrated partly into the eye of the upper stone, and served the double purpose of keeping the runner stone in position and of distributing the feed equally on the grinding-surfaces. To further assist

Method of Using the Mill-stone. Section.

this are four curved master-turrows or grooves, radiating from the eye of the grinding-surface of the upper stone. The mill, worked by men or by horses, was of slow speed, and water was introduced to assist the propulsion of the ground material towards the grooved lip in the periphery of the stone. This and the feed were, of course, introduced through the circular hole in the top stone.

On the site of what was evidently the blowing-house is a mould-stone, about 4 feet by 3. The mould is 15 inches long by 11 inches wide at one