Perspective and geometrical drawing adapted to the use of candidates for second and third-class teachers' certificates . ^o. 28,—To find {a) a mean proportional between two 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 right angles to ABthen will AC: CE:: CE: CB. (Fig. 102.) (b) To draw a third proportional to two given lines

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Keywords: ., bookcentury1800, booksubjectgeometricald, booksubjectperspective