The lengths of the links comply with the condition: A͞C=0͞A=r. Link 1 turns about fixed axis 0 and is connected by sliding pairs to sliders 3 and 4. Slider 3 is connected by turning pair B to slider 6 which moves along fixed guides p-p whose axis is perpendicular to axis 0x. Cross-piece Bb of slider 6 is connected by a sliding pair to cross-shaped slider 7 which has guides perpendicular to each other. Link 5 is connected by turning pair C to slider 4 and moves in slider 7. When link 1 turns about axis 0, point D of slider 7 describes versiera-type curve s-s with the equation a²x+xy²=2a²r.
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