Report on the building and ornamental stones of Canada (1912)
Parks, William A. (William Arthur), 1868-1936, Canada. Mines Branch (1901-1936) · Ottawa : Dept. of Mines, Mines Branch · leaf 154
97 If tlic 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 · Geology, Economic · Stone industry and trade
Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.
