A practical course in mechanical drawing for individual study and shop classes, trade and high schools (1912)
Willard, William Franklin, 1879- · Chicago : Popular mechanics company · leaf 72
CHAPTER V CONVENTIONS USED IN DRAFTING /CONVENTIONS, as explained in a previous chap-^^ ter are customary methods or symbols establishedby usage and precedent and are generally employed forthe sake of uniformity and convenience the world over.Their use and convenience will be readily understoodby…
Mechanical drawing
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