A manual of elementary geometrical drawing, involving three dimensions. Designed for use in high schools, academies, engineering schools, etc.: and for the self-instruction of inventors, artisans, etc. ... In five divisions .. (1868)
Warren, S. Edward (Samuel Edward), 1831-1909 · New York : J. Wiley & son · leaf 87
Fig. 1. Fig. 2. … Fig. 3. Fig. 4. 1st. The required point being in the horizontal plane, its verti-cal projection is (by Prin. 1°) in the ground line, GL. 2nd. The point being on the given line, its vertical projection is,by (Prin. 2°), in the vertical projection of that line. Hence h\ the intersection of a6withGL,…
Geometrical drawing · Mechanical drawing
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
