Link 1 turns about fixed axis F₁. Slider 2 moves along slot a of link 1. Flexible cord 3 is attached at point A in slot a and passes through an eye in pin d of slider 2, having its other end attached to fixed point F₂. When slider 2 moves along slot a, its point B describes hyperbola q-q with its foci at points F₁ and F₂ and with the equation y²/a²-x²/b²=1 where b=sqrt(c²-a²). By varying distances a and c, quadratic hyperbolas of various types can be traced.
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