A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 32
ure. Circumscribe a circle about the polygon.Many flower forms—pansy, violet—are pentagonal inshape. Fig. 19. Exercise 20.—Hexagon. Within a circle. Construc-tion : Lay off the radius six times on the circumfer-ence of the circle and connect the points. Without theprotractor, what is the interior… … Fi£:. 20 Exercise 21*—Hexagon by means of the 30-60 tri-angle. The hexagonal bolt is an illustration of the useof the hexagon. Fig. 20. Exercise 22,—Hexagon without a given circle. Fig. 21 Exercise 2^.—Heptagon within a circle. Construc-tion. Draw a line making any angle with AB. DivideAB into as…
Mechanical drawing
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