Link 1, turning about fixed axis 0, is connected by sliding pairs to sliders 2 and 3. Slider 4 moves along fixed guides t-t whose axis makes the angle α with axis 0x. Cross-piece CB of slider 4 is connected by turning pair C to link 5 . Link 5 moves in X-shaped slider 2 which has guides making the angle 90°-β with each other, where β is the angle between radius 0͞F=r of circle p-p and axis 0x, and equals β=arccos(a/2r). Slider 3 is connected by turning pair B to slider 4. When link 1 turns about axis 0, point D of slider 2 describes cissoid s-s of circle p-p, of radius r and passing through point 0, and of straight line q-q. The equation of the cissoid is ρD=0͞D=b*sin(α)/sin(α- ϕ)-2r*cos(β- ϕ) where ϕ is the polar angle between vector ρD and polar axis 0x.
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