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 101
SHADING. Y3 invisible. Let us now suppose a reflecting medium, though animperfect one, as the atmosphere, to be thrown around the body.By reflection, every part of the body would receive some light fromall directions, and so would remit some light to the eye, making thebody visible, though faintly…
Geometrical drawing · Mechanical drawing
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
