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 142
cuttingedges of chisels. They are made in a great number- of sizes and d(\>^igns andare driven either by worm or screw gear. These machines are of necessityheavy and at the same time must be capable of very delicate adjustment.The planers of the Patch Manufacturing Co. vary from 1(),500 to… … Pneumatic Surfaeius Machine.
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.
