Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 201
. .., etc. §139 … Fig. 120. 143. Supplemental Chords. — The lines joining any point of an ellipse to the ends of adiameter are called supple-mental chords. Thus, PQ and PQ are suchchords. Draw ON II to PQ and ON 11toPQ. Then N and N are the mid-points of PQ and PQ..-. ON will bisect chords parallel to PQ, and ON…
Geometry, Analytic
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