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 116
Telescope Feed Hummer Drill. X! … Q 83 Companys quarry noar Bancroft, the manager prefers a single bitted drilland uses a 2 inch starter with the heavy machines, and a If inch starterwith the h<^ht machines. At the North Lanark marble quarries a 2^ inch+ shaped ))it is used with the heavier machines, and a If inch bit for plug…
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.
