Prob. To draio a spiral of one turn in a given circle. Divide the circle into any num-ber of equal parts, say twelve, bythe lines OA, OB, OC, etc., and aradius OA into the same numberof equal parts by the points 1, 2,3, 4, etc. With O as a centreand radius 01 draw an arc cuttingOB in M ; with… … 42 GEOMETRICAL PROBLEMS. Prob. 89. To draio in a given circU a spiral of any num-ber of turns, say tioo. Draw radii dividing the circleinto any number of equal parts.Divide any radius, as OA, into asmany equal parts as turns in thespiral, and divide each part intoas many equal portions in points1,…
Mechanical drawing
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