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/g. 3/6 … Ffg. 3/7 Construction for Circles. — When circles occur they appear asellipses and may be drawn by plotting points from the ortho-graphic projection as in Fig. 313 or by the more usual approxima-tion shown in Fig. 314, where the lines are drawn perpendicularto the points of tangency of the…
Mechanical drawing
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