Link 1 turns about fixed axis 0 and is connected by sliding pairs to sliders 3 and 2. Slider 4 moves along fixed guides t-t whose axis is perpendicular to axis 0x. Slider 4 is connected by turning pairs B and C to slider 3 and to link 5. Link 5 moves in cross- shaped slider 2 which has guides perpendicular to each other. When link 1 turns about axis 0, point D of slider 2 describes De Longchamps curve s-s with the equation ρD=0͞D=(r/cos(ϕ))+2r*cos(ϕ) where ϕ ist he polar angle between vector ρD and polar axis 0x. The De Longchamps curve is the companion of a cissoid of the circle p-p (of radius r, with its centre at F and passing through point 0) and of straight line q-q, passing through centre F.
$1197$LG,Ge$