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ABDANKABAKANOWICZ QUADRATRIX
Curve studied by A.Abakanowicz in 1889.
Bruno AbdankAbakanowicz (18521900): polish engineer. Other name: circular integral. 
Differential equation: .
Cartesian parametrization: . Transcendental curve. 
The quadratrix of AbdankAbakanowicz is the curve plotted
by the integraph of AbdankAbakanowicz, starting from a circle.
This device allowed, on the basis of a given curve of
parametrization X = x(t), Y = y(t),
to build the curve of Cartesian parametrization:
For the curve we are dealing with, x(t) = R sin t and y(t) = R cos t.

As its name indicates, it is a quadratrix
(see [Carrega] p 85).
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© Robert FERRÉOL 2016