Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 268
ilosopher (1623-62). See note 10,Appendix. HIGHER PLANE CURVES 251 PQ is of constant length. OM is the J_ on PQ. The pointM describes the rose. The ± OM is a maximum when Mfalls at the mid-point ofPQ. [For the altitude Q of a right A of a con-stant hypothenuse isgreatest when the A isisosceles.] To… … Fig. 145. [2a = length of PQ.] The result is, y sin $ = y cos [The equation is of the sixth degree].* Note. — The mid-point of PQ describes a circle of radius a. SPIRALS 206, Definition. — A spiral is the locus of a point whichrevolves about a fixed point or pole, while its radius vectorand…
Geometry, Analytic
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