Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 402
arallelogram for point-ing combination drills for drilling and reaming stone, metal, &c.No. 9 is a quadrangular prism with a planer cutting point for cut-ting or planing metal, &c. No. 10 is a truncated prism for work-ing stone, &c. No. 11 is similar to No. 8, and used for the… … stone, &c. No. 1-1 is a quadrangular pyramid used for reamingstone or metal. No. 15 is similar to No. 5, and is used for thesame purpose. No. 16 is a quadrangular cube, with graver edge,for cutting metal, &c. No. 17 is a flat octahedron for drillingstone, glass, &c. No. 18 is a flat…
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