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spiral |
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spiral 1. Geometry one of several plane curves formed by a point winding about a fixed point at an ever-increasing distance from it. Polar equation of Archimedes spiral: r = aθ; of logarithmic spiral: log r = aθ; of hyperbolic spiral: rθ = a, (where a is a constant) 2. another name for helix 3. a flight manoeuvre in which an aircraft descends describing a helix of comparatively large radius with the angle of attack within the normal flight range 4. Economics a continuous upward or downward movement in economic activity or prices, caused by interaction between prices, wages, demand, and production spiral [′spī·rəl] (mathematics) A simple curve in the plane which continuously winds about itself either into some point or out from some point. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| And here's a memory of my own: At the opening of the Museum of Modern Art's 1973 Duchamp show, I was standing in front of the spiraling Rotary Demisphere (Precision Optics) of 1925 with a group of artists, among them Serra, who remarked somewhat sadly that, after all this time, the work seemed rather "lightweight. As shown in Figure 1, we propose a three-tiered approach to spiraling in new technology that will enable requirements and acquisition proponents to respond to rapid changes in technology and the ability of threats to adapt inside our traditional materiel acquisition cycles. A snail with a shell spiraling to the right can't mate readily with a lefty. |
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