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 104
1,000 lbs., and are capable of sinking to depths of from4 feet to over 30 feet. The price likewise varies greatly, but good drills costfrom less than S200 up to S500 according to size and efficiency. Thedrills used maybe single l)itted but the cutting face is usually made either+ or X shaped. As in…
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.
