Burn, Robert Scott · London : Ingram, Cooke, and Co. · leaf 130
% 117. JO J l 1Z 13 1L 15 PERSPECTIVE DRAWING. 121 eleven parts, and with nine of these make the line de perpendicular toa b ; the line d c is in the proportion of 9 to 11 to the line a b. The line € … dc\& next to be divided into the same number of equal parts as a b, as 15.Hence it follows that any measurement taken from the scale of equal partsa b can be taken from the isometrical scale d c, and all measurements thustaken would be in strict isometrical proportion. Thus in figure 118,…
Drawing · Wood-engraving
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