For testing the force laws of triangles, parallelograms, and polygons. A round 40 cm diameter aluminium disc with a 360 degree graduation. Complete with levelling screws, a clamping system to hold the table at any desired angle, five sliding clamp pulleys, a centre ring, string, and five sets of iron nickelled slotted weights, each having nine slotted weights and one hanger weighing 50 gms.