Spanton, J. Humphrey (John Humphrey) · London, Macmillan and Co., Limited; New York, The Macmillan Company · leaf 109
e ofpolygons, m.arked POL, on the inner side of each leg. The sectoral lines proceed in pairs from the centre of thehinge along each leg, and although the scales consist of twoor three lines, parallel to the sectoral lines, all measurementsmust be made on the inner lines of each scale, i.e. the… … Fig. 194. point on a line on one leg to a similar point on a corresponding-line on the opposite leg, it is called a transverse distance. Simple proportion.—Let AB and AC (Fig. 195) representa pair of sectoral lines, and BC and DE b,two transverse measurements taken betweenthis pair of Hnes ; then…
Geometrical drawing · Design · Drawing
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