The lengths of the inks comply with the conditions: B͞D=a and B͞C=b, where a and b are semiaxes of ellipse q-q. Slider 1 moves along fixed guides p-p whose axis coincides with axis 0y. Slider 1 is connected by turning pair D to link 4 which, in turn, is connected by turning pair C to slider 5. Slider 5 moves along fixed guides t-t whose axis coincides with axis 0x. Sliders 1 and 5 have cross-pieces Dd and Cf whose axes are parallel to axes 0x and 0y. These cross-pieces are connected by sliding pairs to cross-shaped slider 6 which has guides perpendicular to each other. Link 2 is connected by turning pair B to link 4 and by a sliding pair to slider 3 which, in turn, is connected by turning pair A to link 6. When slider 1 moves along guides p-p, point B of link 2 describes ellipse q-q. The equidistant curves s-s and r-r are described by points E and F of link 2.
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