Essentials of drafting; a text and problem book for apprentice, trade and evening technical schools (1918)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 66
A \ </ Fig. /I2 … heads or nuts are finished or machined, the distance across flatsis often made Vie inch smaller than standard, in which case 50 ESSENTIALS OF DRAFTING The proportions of bolt heads and nuts are collected in thefollowing list, which also gives some approximate values to beused when drawing to small…
Mechanical drawing
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