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 151
__-—_(_.__•__ 18^ I ^le^ *2: /o ::d *i^~.r .1 ^ .1. I ,1 -/- [f I I I i._i_. L_J … Fig:. 152 of a cone and hexagonal prism, or the chamfered por-tion of a hexagonal nut. MECHANICAL DRAWING 149
Mechanical drawing
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