To verify the relationship between forces action at a point. Comprises board 65 x 50cm, with two aluminium pulleys, 50mm dia, on clamp, for mounting in any position. Complete with three hangers iron nickel-plated 50gm and 12 slotted weights of 50gm each, supplied with reel of cotton thread and a ring.

For demonstrating the principle of the parallelogram law of forces and polygon of forces. A unit is a drawing board size : 75 x 60cm fitted on two side pillars for standing. The board is supplied complete with two pulleys (clamp pattern) 3 x 50gm hangers and 12 slotted weight of 50gm, reel of cotton thread and a ring.

To verify the laws of triangle, parallelogram and polygon of forces. Heavy aluminium casted top disc, 40 cm. diameter is accurately turned and graduated in degrees. It is provided with 4 frictionless adjustable pulleys having pivots of hardened steel, cords from central ring carries hangers for slotted weights. Pulley clamps have an index to show direction of forces. The base is of heavy cast iron with levelling screws and vertical rod is nicely polished supplied complete with 4 mass hangers and 12 masses (2 x 10 g, 2 x 20 g, 4 x 50 g, 4 x 100 gm).

Same as above, but with compressed 12mm thick wooden board 30cm dia. disc instead of Aluminium disc.

Consists of a graduated meter rule with fulcurm, figured 50-0-50cm balanced and fitted into a grooved wooden stand with hangers supplied without weights.