Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 494
by friction. lubrication by running water, so that the re-duction may be smooth and uniform, are thesame in both cases, and the forward move-ment of the waves and the opposite motion ofthe undertow supply the rotary motion of thetumbling barrel in the marble-mill. The grind-ing goes on in a… … From Elements of tieulogy by Noiton, published Uy Glnn & Co. ONE OF FATHER NEPTUNES MARBLE FACTORIES variety, but bits of glass from wrecks, andhard coal dropped by passing vessels, wererolled into pebble form by the waves. In the eighteenth century most marbleswere made from the chips struck…
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