Notes on technical sketching and free hand lettering for engineering students
A 1907 instructional manual on technical sketching and freehand lettering by Alton Lincoln Smith, printed at Worcester, Massachusetts, for engineering students. Line diagrams explain projection planes, sight lines and shade lines, alongside sketched gears, racks, bevel pinions, bolts, rivet holes and lettered cubes—usable as clean mechanical line art, keyed diagram labels, and construction-line geometry.
