Tractrix curve, used for a horn/speaker & valve head
thingiverse
A tractrix curve served as the basis for designing horns and speaker geometries; the resulting shape depends on the axis of revolution. I referenced an equation from Wolfram (http://mathworld.wolfram.com/Tractrix.html) but replaced hyperbolic functions with exponential ones since Solidworks doesn't support the latter (http://en.wikipedia.org/wiki/Hyperbolic_function).
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