The apparatus consists of a spiral spring about 25mm diameter and 10cm length. The upper end of the spring is suspended from a chucknut and the lower end is provided with a small pointer which moves over a vertical scale 0 – 100cm  printed on a metal pipe mounted on a base . The lower end is also provided with hook for carrying weights. All this setup is provided on a heavy metal base, Supplied with weights 50×5 gm set.