The lengths of the links comply with the conditions: D͞K=a and D͞C=b, where a and b are the semiaxes of the ellipse. Link 1, turning about fixed axis 0, is connected by sliding pairs to sliders 3 and 7. Cross-shaped slider 4 moves along fixed guides t-t whose axis is perpendicular to axis 0x. Slider 4 is connected by a sliding pair to slider 5 and by turning pair B to slider 3. Link 6 is connected by turning pairs C, D and K to sliders 5, 7 and 2. Slider 2 is connected by a sliding pair to an extension of slider 4. When link 1 turns about axis 0, point D of link 6 describes companion curve s-s of the cissoid of ellipse p-p and of its tangent q-q at point G. The equation of curve s-s is ρD=0͞D=2a/cos(ϕ)+2(b²/a)cos(ϕ)/(sind²(ϕ)+(b²/a²)*cos²(ϕ)) or y²=x²(4p-x)/(x-2a) where ϕ = polar angle between vector ρD and polar axis 0x, p=b²/a.
$1135$LG,Ge$