The Trammel of Archimedes is a mechanical tool invented by the ancient Greek mathematician Archimedes. It is used to draw curves on a flat surface, like a piece of paper. It looks like a compass, but with two points for the pencil, and one for a ruler. You can adjust the distance between the two pencil points, so you can draw different kinds of curves. You can use it to draw circles, parabolas, and other shapes. The ruler is used to measure the distance between the two points to make sure your curve is the right size and shape.