ud arranged to use of steam for driving the sand are in great measure turn in the end of the movable arm pivoted to the base plate. The tracing rod is hollow, and upon the overcome. Heretofore, by the sand blast process of end which projects over the toothed ring it carries cutting, boring,… … IMPROVED SAND BLAST MACHINE. of the ring is not an exact mul- readily understood from the illustrations. The steam en- tiple of the number of teeth The figures shown in the smaller engraving were in the pinion, the ring will, by the differential move- ters by the pipe, M, but by opening a cock, D,…
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