Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 729
int of sight is projectedat S and S; D and Dj are the points of distance. The perspective of each point is found by drawing its perpendicular anddiagonal and fixing the intersection of their perspectives. The perpendicularsand diagonals must lie in their proper plane. Thus those at the top of… … Fig. 1795. Fig. 1796. points on it to enable the perspective curve to be traced through them \ a g e cis the horizontal circle. Take any number of equidistant points on it, as a h c^etc. Their perspectives are found by the usual method of perpendiculars anddiagonals at a^ h^ Ci, etc. The curve…
Mechanical drawing
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