... 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 170
Older part of one of the Quarries at We.st Rutland, Yt., showing the method of Quarrying on highly inclined beds and the work of the Diamond Boring Channeller. I ^ … 3 0139 o aP5 S3 11 101 feet of channel in a clay of 10 hours. They strike 290 blows a minute, cutJ inch deep, and travel forward f inch between strokes. IngersoU-Randdrills are employed for the most part, each drill being actuated by air froma small electrically driven compressor by the General…
Building stones
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