Elementary mechanical drawing, for school and shop (1886)
Aborn, Frank, 1845- [from old catalog] · Cincinnati, New York, Van Antwerp, Bragg & co · leaf 24
circle,2 in. (Fig. 15.) Prob. 7.—An arch is 4 in. in s^V^lh^ diameter on the inner circle. /S^ ^\\ The key-stone is 20° wide and by \\ -J in. long measured on the /_] r □ radius, and on each side of the Fis-16- key are eight equal blocks f in. long measured on the radii. Represent the face of the… … Fig. 17. The chord of an arc of 60° is equal to the radiusof the arc. Prob. 1.—Draw a circle f in. in diameter, anddivide its circumference into six equal arcs. Solution.—Describe a circle AF, f in. in diam-eter, and, without changing the di-viders, set the needle-point at anypoint in the…
Mechanical drawing
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