Mechanical drawing : a manual for teachers and students (1902)
Cross, Anson Kent · Boston : Ginn & Co. · leaf 33
always be a point inthe ellipse. Its position may be markedby a sharp lead pencil. The best way isto use a needle point, and make very fine punctures in a straight line drawn near the edge of the trammel. The needle may then be placed through L and on the long axis, and the paper revolved about L… … Problem 45. proximate ellipse.
Mechanical drawing
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