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 37
20 ESSENTIALS OF DRAFTING … the point to the foci. Extend the Unes and bisect the angleFiPE, or the angle F^PG. This bisecting hne P H is the re-quired tangent. A line through the point P and perpendicularto the tangent is called a normal. The major and minor axes of an ellipse being given, thefoci may be located by draw-ing…
Mechanical drawing
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