The lengths of the links comply with the condition: 0͞A=A͞C=a. Link I, turning about fixed axis 0, is connected by turning pair A to slider 3. Slider 3 moves along cross-piece Fn of slider 4 which moves along fixed guides p-p whose axis coincides with axis 0x. Link 5, turning about axis 0, is connected by sliding pairs to sliders 6 and 7. Sliders 2 and 7 are connected together by turning pair D. When link 1 turns about axis 0, point D traces strophoid s-s with the equation ρD=0͞D=a*cos(2ϕ)/ cos(ϕ) where ϕ is the polar angle between vector ρD and polar axis 0x.
$1139$LG,Ge$