... 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 158
1 97 If the beds of stone are too heavy, or if the parting planes between thebeds are too tight, the plug and feathers method cannot be applied withadvantage to the actual quarrying of the rock. It is under such conditionsthat the quarryman is tempted to resort to the use of explosives. In thecase…
Building stones
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