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One of the mechanisms from the museum of History of Saint-Petersburg State University is being analysed. This mechanism is named after the French mathematician and mechanician, supposedly the creator of this design, Jean Gaston Darboux. There is little description of such a mechanism in the literature on the theory of machines and mechanisms. Its properties need to be studied. At the laboratory workshop, simple formulas are found for the implementation of the animation of the movement of this mechanism. This model for the mechanism of the 19 century is created during the student workshop.