A simple apparatus  to study the Young's Modulus ,Rigidity Modulus  and Poisson's Ratio  of the test wire. This Apparatus consists of two inertia bars of equal length, approx. 30 cm length, and 12 mm square cross-section, with holes drilled at their centres. The bars have screws fitted to hold a test wire approx. 30 cm long and 1 mm dia. Supplied with three test wires and a ceiling bracket with hooks to hold the inertia bars.