Excerpt from Geometric Properties Completely, Characterizing All the Curves, in a Plane Along Which the Constrained Strained Motion Is Such That the Pressure Is Proportional to the Normal Component of the Acting ForceThe inverse of this quartic 18 an hyperbola with asymptotes parallel to the nodal tangents of the quartic. The locus of the mid-point of the chord of this hyperbola cut from the normal to the given direction at the given point is ...
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