... Report on the building and ornamental stones of Canada, vol. I-V (1912)
Parks, W. A. (William Arthur), 1868-1936, Canada. Mines Branch · Ottawa : Government printing bureau · leaf 144
89 until sufficiently reduced. The finish produced by the rubbing bed issufficient for outside work in marble and is known as the sand finish. … Fig. 4. Overhead rubbing bed. Gritting and Polishing Machines. For further smoothing, the stone is taken from the rubbing beds to thegritting machines and thence to the polishers. Whether for granite or formarble the construction of all these machines is much alike, but the weightand rigidity vary…
Building stones
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