| 单词 | parabolic spiral |
| 释义 | > as lemmasparabolic spiral parabolic spiral n. Geometry a two-armed spiral in which the length of the radius vector is proportional to the square root of the angle it makes with a fixed line (originally formed by deforming a parabola so that its axis became a circle while the ordinates remained perpendicular to the axis); formerly also called helicoid parabola. ΚΠ 1704 J. Harris Lexicon Technicum I Helicoid Parabola, or the Parabolick Spiral, is a Curve which arises from the Supposition of the Axis of the common Apollonian Parabola's being bent round into the Periphery of a Circle. 1852 C. Davies Elem. Differential & Integral Calculus (new ed.) viii. 179 Hence, (u−r)2=2pt, is the equation of the parabolic spiral. 1928 Amer. Math. Monthly 35 378 Discuss the modes of the parabolic spiral (ρ−a)2=caθ. parabolic spiral spiral of Archimedes, a curve traced by a point moving uniformly along a line which at the same time revolves uniformly round a fixed point in itself. equiangular spiral, hyperbolic spiral, logarithmic spiral, loxodromic spiral, parabolic spiral: see these words.extracted from spiraln.< as lemmas |
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