Link 1 has the form of a bent lever. Arm Ob of link 1 is connected by a sliding pair to slider 3 and arm Od by sliding pairs to sliders 6 and 7. Slider 3 is connected by turning pair A to cross-shaped slider 4 which has guides perpendicular to each other. Slider 4 moves along fixed guides r-r whose axis is parallel to axis 0y. Link 5 is connected by turning pair C to slider 6 and by a sliding pair to slider 4. Slider 8 moves along fixed guides t-t whose axis is parallel to axis 0y. Slider 8 is connected by turning pair B to slider 7. Cross-piece Bf of slider 8 has its axis parallel to axis 0x and is connected by a sliding pair to cross-shaped slider 2 which has guides perpendicular to each other. Link 9 is connected by turning pair C to slider 6 and by a sliding pair to slider 2. When link 1 turns about fixed axis 0, point C of slider 6 describes parabola s-s and point D of slider 2 describes the upper branch of polytropic curve q-q with equation y=kk^(-1/2) where k=a*sqrt(2p), 2p and a = constant dimensions of the mechanism. To trace the lower branch of curve q-q, the links of the mechanism are reassembled symmetric to the axis 0x.
$1206$LG,Ge$