FIELD: education, in particular, for treatment of variation calculus, for example, two-dimensional Brachistochrone functions. SUBSTANCE: device base has picture of X-Y coordinate system and Brachistochrone function graph. Start and end of guide are respectively start and end of function graph. Shape of guide is fixed by means of pins in holes of base. Ball movement timer has start and finish devices. Start device has electromagnet and start button. Finish device has contact group with ball catcher. EFFECT: increased functional capabilities. 2 dwg
