Elementary mechanical drawing, for school and shop (1886)
Aborn, Frank, 1845- [from old catalog] · Cincinnati, New York, Van Antwerp, Bragg & co · leaf 19
Fig. 11. Prob. 1.—Describe an arc of 60°, with a radius of in. /b Solution.—Describe a cir-cle ABD, | in. in radius.Draw a diameter AD. Placethe protractor on the circleABD, so that its center anddiameter coincide with thecenter and diameter of thecircle, and mark the 60°point, 6, at its edge.… … Fig. 12. 18 MECHANICAL DRA WING. other end is at D, the end of the diameter fromwhich it was measured. BD is the required arc. Prob. 2.—Describe an arc of 120°. Radius, -| in.Prob. 3.—Describe an arc of 90°. Radius, 1-J- in.Prob. 4.—Describe an arc of ,30°. Radius, If in.Prob. 5.—Describe an arc of…
Mechanical drawing
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