The lengths of the links comply with the conditions: A͞K=K͞B=B͞0=0͞A, i.e. figure AKB0 is a rhombus linkage. Slider 4 moves along fixed guides p-p. Sliding link 1 turns about fixed axis C. Link 1 moves in sliders 2 and 3. Sliders 3 and 4 are connected together by turning pair D. Link 5, whose axis forms diagonal AB of rhombus linkage AKB0, is connected by turning pair D to sliders 3 and 4. Link 5 moves in sliders 6 and 7 which are connected by turning pairs A and B to the links of the rhombus linkage. When sliding link 1 turns about axis C, point K describes a strophoid with the equation •y²=x²(a-x)/(a+x) where a=0͞C.
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