The lengths of the links comply with the conditions: A͞B=a₂ and A͞E=sqrt(a₁²+b₂²)=sqrt(a₂²+b₁²) where a₁ and b₁ are the semiaxes of ellipse m-m, and a₂ and b₂ are the semiaxes of ellipse p-p.Link 1, rotating about fixed axis A, is connected by turning pair B to slider 2 which moves along the axis of link 3. Link 3 rotates about fixed axis C. Link 5, rotating about fixed axis A, is connected by turning pair E to slider 4 which moves along axis t-t of the cross-piece of slider 2. Point A is placed at the common centre of ellipses m-m and p-p ,nd a point C at one of their common foci. Then, when link / rotates, axes t-t and q-q of the cross-pieces of sliders 2 and 4 simultaneously envelop the confocal ellipses m-m and p-p.
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