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 32
^ Each draughting office seems at present tobe a law unto itself in this matter. 74. As affording valuable examples for further exercisewith the ruling pen the system of section - lines adopted bythe Pennsylvania Railroad is presented on the opposite page.The wood section is an exception to the…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
