Industrial drawing and geometry; an introduction to various branches of technical drawing (1911)
Spooner, Henry John, 1856- · London, New York [etc.] Longmans, Green, and co. · leaf 47
Fig. 82.—Division of a space. Fig. 83.—A third proportional to two given lines. 61. To find a Third Proportional to Two given Lines, A and B.—Let A and B (Fig. 83) be the given lines. Then a line PROPORTION, ETC. 29 X is requii-ed, such that A : B : : B : X. Draw any indcfiuite Hue, IP. At 1 draw…
Mechanical drawing · Geometrical drawing
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