Link 1 has the form of a bent lever and its arms a and b move in sliders 4 and 5 which turn about fixed axes A and 0. Link 1 is connected by turning pair B to slider 2. Slider 2 moves along leg d of frame 3 which slides along fixed guides p-p. Sliders 6 and 7, connected together by turning pair K, move along leg e of frame 3 and arm b of link 1. When frame 3 slides along guides p-p, point K describes the loop of a strophoid with the equation y²=x²(c-x)/(c+x) where c is the distance between the vertical legs d and e of frame 3 and is equal to c=A͞K/2.
$1138$LG,Ge$