Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 172
Fig. 318. To find the minor axes of these curves, assume any point, 0^ upon the pro-longation of the diameter of the perpendicular C D; draw through this pointthe straight line 0^ o\ inclined at an angle of 35° 16, to A B or its parallel, anderect upon it the perpendicular E F^ The projection of…
Mechanical drawing
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