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 130
the cutting engin(\ The air is therefore notexhausted but travels between pulsator and engine in a closed circviit. Manyof these machines have l)een installed in some of the largest inail)l( (Hiairic^sin the United States and are said to have a gr(>ater ediciency per unit of i)ow(-rconsumed than… … 87 The Gang Saw. The f2;ang saw frame consists of four viprifrht posts of wood or preferaljlyof stiuctural steel, securely bolted to the foundation and strengthened bythe necessary side pieces and braces. The space inside the four posts isoccupied by a hopper shaped depression in the floor. From…
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.
