The lengths of the links comply with the conditions: A͞B=B͞C=b, F͞B=E͞D=a and B͞D=F͞E=c. Figure FBDE is a parallelogram. Sliders 1 and 5 move along fixed guides q-q whose axis coincides with axis 0x, and are connected by turning pairs A and C to links 3 and 4. Links 3 and 4 are connected by turning pair B to each other and by turning pairs D and F to links 6 and 7. Links 6 and 7 are connected by turning pairs E to slider 2 which moves along fixed guides t-t whose axis coincides with axis 0y. When slider 1 moves along guides q-q, point B describes ellipse p-p with the equation (x²/(a-c)²)+(y²/b²)=1.
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