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 150
f~/^. 3/5 Positions of the Axes. — The axes may be placed in any posi-tion provided the angles between them are kept equal to 120°as illustrated in Fig. 312. … F/g. 3/6
Mechanical drawing
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