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 31
Fig. 18 28 A PRACTICAL COURSE IN Exercise ip.—Pentagon. Construction: Base ij4-i5^-With one radius = to the base length describe arcsfrom centers i, 2 and 3. Connect i and 2 with 7 and8 and complete the pentagon. Inscribe a circle within … Fig. 19 the figure. 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…
Mechanical drawing
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