The lengths of the links comply with the conditions: A͞B=0͞B=a, 0͞C=0͞F and C͞E=F͞E. Figure ECOF is a rhombus linkage. Link 1 turns about fixed axis B and is connected by turning pairs A to link 9 and slider 3 which moves along axis 0d of link 2. Link 2 turns about fixed axis 0. Link 9 is connected by a sliding pair to cross-shaped slider 4 which has guides perpendicular to each other. Slider 4 moves along axis 0b of link 8 which turns about axis 0 and is connected by turning pair F to link 7 . Link 5 is connected by turning pair C to link 2. Links 5 and 7 are connected by turning pairs E to slider 6 which moves along fixed guides p-p whose axis coincides with axis Ox. When link 1 turns about axis B, point D of slider 4 describes triple right folium q-q with the equation ρD=0͞D=2a*cos(ϕ)sin²(ϕ) or (x²+y²)²=2ax(x²-y²) where ϕ is the polar angle between vector ρD and polar axis 0x.
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