g the screen teeth a backward curve, as shown in section at A, Fig. 2. serve their general shape. at an incline, to facilitate the passage of the grain, and in It will readily be understood how, in course of use, this The processes equally applicable to the dead smooth file combining therewith a… … tion of Mr. J. Oldendorph, file sharpening, and not only FILE SHARPENING BY THE SAND BLAST. Jr., of Waterloo, 111., the spe- to this but to the sharpening of cial feature is the mode of all edge tools, even to razors, securing the handles to the iron beam, so as to firmly brace is entirely novel,…
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