To verify the laws of triangle, parallelogram and polygon of forces. Heavy aluminium casted top disc 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)
200 mm diameter metal wheel mounted on a balanced horizontal shaft in metal bracket drilled for wall mounting & pointer is fixed to one of the brackets.
It consists of a wooden wheel 150 mm diameter and axles 75 mm and 25 mm diameter. A steel rod passes through the centre has cone bearings. The brackets are of malleable Iron with steel adjustable pivots to reduce friction to minimum. Mounted on wood board. Supplied complete with steel hook and cord but without masses.
