... 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 146
to the cuttingedges of chisels. They are made in a great number of sizes and designs andare driven either by worm or screw gear. These machines are of necessityheavy and at the same time must be capable of very delicate adjustment.The planers of the Patch Manufacturing Co. vary from 16,500 to… … Pneumatic Surfacina; Machine.
Building stones
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