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
No. 27,—To construct the involute of the circle. Divide the circle into any number of equal parts and drawthe radii, numbering them 1, 2, etc. Draw the tangents, mak-ing the jfirst the length from 1 to 2, the second twice thislength, the third three times, and so on. When all the tan-gents have… … 129 Fig. 101. No. 28.—To find {a) a mean proportional between two givenlines.
Geometrical drawing · Perspective
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