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 132
them 1, 2, etc. Draw the tangents, mak-ing the first the length from 1 to 2, the second twice thislength, the third three times, and so on. When all the tan-gents have been drawn thus, begin again at 1 by producingit, and so get a second series of points. Then draw a curvethrough the points,… … 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 AB;then will AC : CE : : CE : CB. (Fig. 102.)(b) To draw a third proportional (greater). ^
Geometrical drawing · Perspective
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