Slider 1 moves along fixed guides d-d whose axis is parallel to axis Oy. Cross-piece Aa of slider 1 is connected by a sliding pair to slider 7. Slider 6, moving along fixed guides t-t whose axis coincides wi th axis Oy, is connected by turning pair B to slider 5. Cross-piece Bb of slider 5 moves in slider 4 which is connected by turning pair D to slider 7. Link 3 is connected by turning pair A to slider 1 and by sliding pairs to slider 5 and to slider 2 which turns about fixed axis F. Point F is placed at the focus of a parabola and the axis of guides d-d are made to coincide with the directrix of the parabola. Then, when slider 1 moves along guide d-d, point D describes parabola q-q wi th the equation y²=2px, where p is the distance from the focus of the parabola to its directrix.
$1100$LG,Ge$