[alogo] Piriforms

Artobolevsky link-gear mechanism for converting circles into piriform curves
(Artobolevsky, bd II, p. 266).

[0_0] [0_1] [0_2]
[1_0] [1_1] [1_2]


r = AD (modify r to change the length of AD).
a = OE,
b = OA,

x^4 - 2bx^3 - (r^2 - b^2)x^2 + a^2y^2 = 0.

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