Link 1 slides in fixed guides b-b. Rigidly attached to link 1 is a slotted member whose slot a is perpendicular to the axis of guides b-b. Slider 2 moves along slot a. Flexible cord 3 is attached with one end at point A in slot a, then passes through an eye in pin d of slider 2 and has its other end attached to fixed point F. When slider 2 moves along slot a, point B of pin d describes parabola q-q with its focus at point F and with the equation x²=2py. By varying distance p, quadratic parabolas of various types can be traced.
$2027$FL,Ge$