Link 1, having the form of a bent liver with angle AOd equal to 90°, turns about fixed axis 0. Link 1 is connected by turning pair A to slider 2 which moves along cross-piece t-t of slider 3. Slider 3 moves along fixed guides p-p whose axis coincides with axis 0x. Arm 0d of link 1 moves in slider 5 which is connected by turning pair B to slider 4. Slider 4 moves along cross-piece t-t of slider 3. When link 1 turns about axis 0, point B describes a Kappa curve with the equation y²=x⁴/(a²-x²) where a=0͞A.
$1156$LG,Ge$