Elements of analytical geometry and of the differential and integral calculus (1866)
Davies, Charles, 1798-1876 · New York, Barnes & Co. · leaf 356
motion ofthe line begins, let us sup-pose a point to move fromA along the line, in thedirection AB C. Whenthe line takes the posi-tion ADE, the point will have moved along it, to some point, as Z>, and will h.nvcdescribed the arc AaD, of the spiral. When the linetakes the position ADE\ the point… … 152 DIFFEnENTIAL CALCULUS. [sEC. VII. generating point will describe an indefinite spiral. Thepoint A, about which the right line revolves, is calledthe pole; the distances AD, AD\ AJS, are called ra-dius-vectors or radii-vectores ; and the parts AaDDB,BFFC, described in each revolution, are called…
Geometry, Analytic · Calculus
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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-322-213.webp)
