Perspective and geometrical drawing : adapted to the use of candidates for second and third-class teachers' certificates (1887)
McGuirl, Thos. H. (Thomas H.) · Toronto, Ont. : W. Briggs · leaf 134
129 Fig. 101. No. 28.—To find {a) a mean proportional between two givenlines. … Fig. 102. Let AC and BC be the given lines; place them in astraight line AB; bisect AB in D, and on AB describe 130 DRAWING. semicircle AEB; through C draw CE at riglit angles to AB;then will AC : CE :: CE : CB. (Fig. 102.)(b) To draw a third proportional (greater).
Geometrical drawing · Perspective
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