| 单词 | proportional spiral |
| 释义 | > as lemmasproportional spiral proportional spiral n. now historical and rare = logarithmic spiral at logarithmic adj. a. ΚΠ 1687 Philos. Trans. 1686–7 (Royal Soc.) 16 292 If the Curve described be a Circle passing through the Center of tendency; then the force or tendency towards that Center is in all points as the fift power or squared-cube of the distance therefrom reciprocally. If in the proportional Spiral, reciprocally as the cube of the distance. 1696 E. Halley in Philos. Trans. 1695–7 (Royal Soc.) 19 205 They [sc. rhumb lines on the globe] are therefore, in that Projection, Proportional Spirals about the Pole Point. 1752 Philos. Trans. 1749–50 (Royal Soc.) 46 561 And hence the proportional Spiral is also called the logarithmic Spiral. 1920 J. Hambidge Dynamic Symmetry: Greek Vase 147 The name logarithmic spiral is due to Jacques Bernoulli. The spiral has been called also the geometrical spiral, and the proportional spiral; but more commonly, because of the property observed by Descartes, the equiangular spiral. < as lemmas |
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