Schmall, Charles Nelson. [from old catalog] · New York, D. Van Nostrand company · leaf 270
radius OC = 2 /ctt. Again, the spires, being every-where equally distant along the radial lines, are said to be parallel. The figure shows the curve for positive valuesof 6*. 208. The reciprocal spiral. — In this curve the radiusvector varies inversely as the vectorial angle i.e., as the… … Fig. 147. Discussion. —The spiral begins at infinity [when ^ = 0] and windscontinually around the pole, always approaching nearer and nearer but 254 AXALYTICAL GEOMETRY never reaching it, or reaching it after an infinite number of spires havebeen described, since p = 0, when d = a:. The…
Geometry, Analytic
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![An illustration from Nicolai Copernici Torinensis De reuolutionibus orbium coelestium, libri VI : Habes in hoc opere iam recens nato, & aedito, studiose lector, motus stellarum, tam fixarum, quàm erraticarum, cum ex ueteribus, tum etiam ex recentibus obseruationibus restitutos: & nouis insuper ac admirabilibus hypothesibus ornatos. Habes etiam tabulas expeditissimas, ex quibus eosdem ad quoduis tempus quàm facillime caculare poteris. Igitur eme, lege, fruere. [Line in Greek] (1543)](https://img.insideoutlibrary.com/img/200/ia-nicolaicopernici00cope-343-234.webp)
