Mechanical drawing self-taught: comprising instructions in the selection and preparation of drawing instruments, elementary instruction in practical mechanical drawing together with examples in simple geometry and elementary mechanism, including screw threads, gear wheels, mechanical motions, engines and boilers (1883)
ugh the port D. They might,of course, be shown by dotted outlines, but they wouldnot appear to such advantage, and on this account itis permissible where artistic effect is sought, the objectbeing to subserve the shading to making the mech-anism and Its operation clearly and readily… … Fg- 307- (h
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
