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 26
thod. Approximate. Fig.II. AE = BD, Fig. 10. Exercise to.—Construct a right-angle triangle oneangle of which is 30*^. The sum of all angles of anytriangle is 180°. If a right angle is 90°, what must theremaining angles be ? This exercise is applicable as an MECHANICAL DRAWING 23 aid in determining… … Fig. 11 Exercise 11.—To find approximately the distanceacross an unknown area by means of similar rightangles. Construction: Select a tree or object on theopposite bank or side as indicated at A. Select another
Mechanical drawing
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