The lengths of the links comply with the conditions: A͞F=D͞F and A͞K=D͞0, where D͞0 is the distance from the focus of the parabola to its directrix. Slider 1 moves along fixed guides t-t, and is connected by a sliding pair to slider 5 and by turning pairs A to links 3 and 8. Slider 4, turning about fixed axis D, is connected by a sliding pair to slider 6 and by another sliding pair to link 3. Sliders 5 and 6 are connected together by turning pair F. Link 9, turning about axis D, is connected by turning pairs G to link 8 and slider 2. Slider 2 moves along link 7 which is connected by turning pair F to sliders 5 and 6. Point D is placed at the focus of a parabola and the axis of guides t-t is made to coincide with the directrix of the parabola. Then, when slider 1 moves along guides t-t, point F describes a parabola and straight line Fe envelops this parabola.
$1106$LG,Ge$