Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 164
the shadow ofany line parallel to D z, hence for yv,which, however, soon runs into theshadow of B C. As b is the intersec-tion of the ray B b with its projectionb-^b, it is the shadow of B, and bibthat of b^B. Then b v is parallel to B C, the line casting the shadi)W being j^rallel to the plane…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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