The lengths of the links comply with the conditions: E͞B=B͞F=F͞D=D͞E=n and A͞B=B͞C=m. Figure EBFD is a rhombus linkage. Link 1 rotates about fixed axis G and is connected by turning pairs B to links 3 and 6 which, in turn, are connected by turning pairs A and C to sliders 7 and 2. Sliders 7 and 2 move along fixed guides t-t. Links 4 and 5 are connected by turning pairs E and F to links 3 and 6 and by turning pair D to each other. When link 1 rotates about axis G, point D describes ellipse q-q with the equation k²x²+y²-2k²*ex-2k*dy+(k²d²+k²e²-R²)=0 where k=-((n+m)/(n-m)). The minor axis of ellipse q-q equals the diameter of circle p-p described by point B of link 1, and the major axis equals the diameter of circle p-p multiplied by k.
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