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 27
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,… … Exercise 12,—Equilateral triangle. Construction :Assume any length for a base. With a radius equal tothe length of base and each terminal C and D as cen-ters describe intersection at X. Connect this point bylines to C and D. Measure the angles of an equilateraltriangle in degrees. What is their sum…
Mechanical drawing
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