d 43 per centmore horse power than its low speeded competitor. At what angle should a drill, to go the quickest speed throughcast iron, be made ? Will the same angle be the best for drilling wroughtiron and steel ?—C. E. G-. Answer: for cast iron the cutting edge of thedrill, should be on an angle… … Let A, B, C, be any triangle, the sides of which being known, the anglesmay be found in the usual manner. From g, the center of gravity, drawlines bisecting the angles. Let x, y, z, be the centers of the circles. Fromx, y, and z, let fall upon the sides AB, BC, CA, the perpendiculars, xc, yf,yd,…
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