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 160
electricity. After various trials thecomjniny has decided to u.^e that type of drill and channeler which is actuateddirectly l)y air which is compres.^ed intlividually for each machine 1)V a smallelectrically diivcn compressor. At the time of my visit 1.) machines of thiskind were in operation…
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.
