The lengths of the links comply wi th the conditions: A͞C=a and A͞E=sqrt(a²+b²) , where a and b are the major and minor semiaxes of the ellipse being enveloped, and angle tEq=90°. Link 1, rotating about fixed axis A, is connected by turning pair E to link 5 which has the form of bent lever tEq. Link 4, rotating about fixed axis C, is connected by a sliding pair to cross-shaped slider 3 which has guides wi th axes perpendicular to each other. Arm Et of link 5 moves in slider 3. Link 2, rotat- ing about axis A, is connected by turning pair B to slider 3. Point A is placed at the centre of the ellipse and point C at one of its foci. Then, when link 1 rotates, the arms of the right angle tEq of link 5 simultaneously envelop ellipse p-p.
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