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Chebyshev's Straight-line Mechanism

This is Chebyshev's linkage. Move the point C with the mouse and observe the movement of the point P. Note that in this linkage the lengths have the following proportions. AB=CD=5 AD=4 and CB=2, with P at its centre.
Comprueba que el mecanismo puede montarse en sus dos ramas, pero no puede pasarse de una a la otra sin desmontarse.