The lengths of the links comply with the conditions: A͞B=0͞A=a/2 and A͞E=E͞B=E͞C=a/4. Link 1 turns about fixed axis 0 and is connected by sliding pairs to slider 3 and to cross-shaped slider 2 which has guides perpendicular to each other. Link 4 turns about fixed axis A and is connected by turning pairs E and B to link 5 and slider 3. Links 5 and 7 are connected by turning pairs C to slider 6 which moves along fixed guides p-p whose axis coincides with axis Ox. When link 1 turns about axis 0, point D of slider 2 describes simple right folium q-q with the equation ρD=0͞D=a*cos³(ϕ) or (x²+y²)²=ax³ where ϕ is the polar angle between vector ρD and polar axis 0x.
$1171$LG,Ge$