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Many instruments of the Historical Collection of the Physics Instruments ofthe University of Palermo date back to the early nineteenth century, whenexperimental Physics begun to be taught in university studies by usinginstruments and apparatuses in the classroom to illustrate the laws of Physics.Among the various instruments belonging to the Collection, there are also theso-called 'paradoxes', instruments with surprising properties that do not seemto follow the laws of Physics. In this article we analyze two 'mechanicalparadoxes' of the Collection and discuss their possible educational use.

Due 'paradossi meccanici' della Collezione Storica degli Strumenti di Fisica dell'Universit\`a di Palermo