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 30
Para//e/ Lines … F/g.24 Fig. 25 Fig. 2 6 generates a line, which may be either straight or curved. Asurface may be formed by moving a line. A plane surface is onewhich will contain two intersecting straight lines. Two straightlines are said to be parallel when they are everywhere the samedistance apart (Fig. 24).…
Mechanical drawing
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