Double cone on inclined plane.
The mechanical paradox consists in a double cone which is able to climb up along an inclined plane. The double cone rises when the slope of the inclined plane is smaller than the product given by the tangent of half the coneâ€™s angle and the tangent of half the angle of slideâ€™s opening. So the phenomenon has nothing paradoxical, but it is in perfect accord with the laws of mechanics. Length Cone 37 cm andÂ second half 19th century.