The Artisan, or, Mechanic's instructor : containing a popular, comprehensive and systematic view of the following sciences ... also biographical notices of eminent scientific men, enriched by portraits : with many interesting and valuable articles relating to the mechanical and useful arts : the whole intended as a companion to the institutes (1825)
Carey, George G · London : Printed for William Cole · leaf 547
ch less ; and if Gothic To form a bridge in perspective, a front arches are used, they may be considerably vieiv. greater, which circumstances must regu- late. Let the station of the observer be oppor Tn form the bridge, and parts, from a site the centre of the nearest arch, his eye one-fourth inch… … With the span of the arch 50, and width distance E F, ef, describe the semicircle, GHFjg' hf; G H F representing the front 40, describe the perspective parallelogram of the opening of the arch, and ghf the A B b a, by prob. 4 ; at the point A, draw A C perpendicular to the ground line, and back…
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