Eaton. tions, and a comparison of these curves with th. cor- To the Editor of the Scientific American : responding ellipses. Scranton, Pa. In reference to the letter of Mr. M. N. Kuka on In drawing an eight-centered oval, three radii are «ni » • "How to Draw an Ellipse," published in your issue of… … a fir b, the student will see that this construction is in lipse can be made by the instrument called the el- July 14, 1 beg leave to say that the figure submitted conformity with a demonstration in the calculus, viz., lipsograph, and by the "string," also by the following that the radius of…
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