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 120
s\nik to the dcsiicd depth. Thesize, weight, power, and design of (•haimcileis vaiV greatly with the chaiaclerof the rock on which they aic intended to opeiate and on t he angle from thevertical which the channel is to assume, it is needless to say that nuichingenuity has been displayed by… … Sullivan Hock Drill inountod on adjustable tripod. y.
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.
