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
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 … Fig. 12 on this side, say D. Lay off a convenient distance fromD to C in the line ADC. Select a point B at right an-gles to AD and construct a parallelogram r)ODC. De-termine point X on the ground wdiich is in line with OC 24 A PRACTICAL COURSE IN and BA and measure the distance XO. By proportion,…
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
