Concho-spiral
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conchospiral — conchoˈspiral [f. Gr. κογχο (see conchology) + spiral.] A kind of spiral curve exemplified in shells. Webster cites Agassiz … Useful english dictionary
Conchospiral — In mathematics, a conchospiral is a three dimensional spiral. In cylindrical coordinates, it is described by the parametric equations: r = μta θ = t z = μtc. The projection of a conchospiral on the (r, θ) plane is a logarithmic spiral. External… … Wikipedia
