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 16
has agreed in convention that they shall indicate that which they also more or less resemble. Whilethere is no universal agreement in this matter there is usually but little ambiguity in their use,especially in those that are drawn ft-ee-hand, since in them there can be a nearer approach to…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
