Elementary projection drawing. Theory and practice. For preparatory and higher scientific schools, industrial and normal classes; and the self-instruction of teachers, inventors, draftsmen, and artisans. In six divisions .. (1880)
Warren, S. Edward (Samuel Edward), 1831-1909 · New York, J. Wiley & sons · leaf 170
are the radii of small semicircles of the hemisphere, to which projec-tions of rays of light may be drawn tangent, and m and g\ arethe true positions of their centres—ym being equal to nm, andyg equal to ng. Drawing arcs of such semicircles, and drawingrays, fd and rS, tangent to them, we determine…
Geometrical drawing · Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
