Spiral line - Uzumakisen (English spelling) spiral
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A plane curve that goes around a single point is called a vortex, helix, or spiral. It is expressed in polar coordinates ( r , θ). (1) r = a θ is called a normal vortex or Archimedes spiral, (2) r = a /θ is called a reciprocal vortex, and (3) r = ae b θ is called a logarithmic spiral or equiangular spiral. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
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平面曲線のうち，1点のまわりをぐるぐる回る曲線をいい，渦線，螺旋，スパイラルなどという。極座標 (r，θ) で表わす。 (1) r＝aθ を正渦線，またはアルキメデスの渦巻線といい，(2) r＝a/θ を逆数渦線，(3) r＝aebθ を対数渦巻線，等角渦巻線という。
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