The lengths of the links comply wi th the conditions: A͞C=A͞B=a, B͞E=2a, and C͞H:D͞F=H͞E:F͞E=2. Link 1, rotating about fixed axis A, is connected by turning pair C to slider 4 which moves along cross-piece t-t of slider 3. Slider 3 moves along fixed guides p-p whose axis is parallel to axis 0x. Link 8 is connected by turning pairs C and H to slider 4 and link 7. Link 7 is connected by turning pairs E and F to slider 6 and link 9. Link 9 is connected by turning pair D to slider 2 which moves along cross-piece t-t of slider 3. Link 5, rotating about fixed axis B, is connected by turning pair E to slider 6 which also moves along cross-piece t-t of slider 3. When link 1 rotates about axis A, point D of slider 2 describes virtual parabola of Cramer q-q wi th the equation 2y=sqrt(x(2a-x))+sqrt(x(4a-x)).
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