American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 94
equal to C on the longer line 1 3, and from 4 draw a line 4_ 5 parallel tfeo 2 3, to cut 1 2 in 5; then 1 5 will be the fourth proportional less. Prob. 101.— To find a fourth proportional greater to three givenlines A, B, and C. When the fourth proportional is to be greater, draw 6 7 equal toB and… … Prob. 102.— To bisect the angle formed by two converging lines,when the lines do not meet. Draw the line 1 2 parallel to AB; draw the line 3 2 parallel toC D, and at the same distance from C D that 1 2 is from A B.Bisect the angle 1 2 3, and the bisecting line E F will also bisectthe angle formed…
Geometrical drawing
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