Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 332
usted by meansof the wedges ///, the screwed tails of wluch pass downwards through the cast-iron ring g, and areregulated by thumb-screws on each side of it. The large openings in the cone, before alluded to, affordaccess for the working of these screws. Small semicircular chambers are formed in… … TJte Millstones.—The diameter of the millstones most in use at the present day is 4 feet, and theirthickness about 12 inches ; one-half of this thickness is composed of French burr, a very hard, thoughporous mineral, of a silicious nature; the other half is made up of plaster of Paris. In…
Mechanical engineering · Mechanics · Engineering
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