Torsion Apparatus

Searle’s pattern. For investigating the torsional rigidity of roads of different materials and to demonstrate that the angle of twist of a given rod over a fixed length is proportional to the applies force. The apparatus consist of two parallel metal support rods with heavy cast metal legs at their end. One of the legs has ball bearing mounted pulley wheel at its outer side with its spindle carrying split collect shuck for holding one end of test rd while other leg. When loaded with masses through the nylon cord wound on the pulley wheel, twisting couple if applied to the test rod. Two aluminium scales, graduated 30o – 0 - 30o x 1o , fixed on pillar support are mounted on the metal supports rods along its length. Also included are two pointers, which when clamped to the test torsion produced in the rod at that point. Supplied complete with two test rods, one each of brass and steel, nylon cord and hook for carrying masses, but without masses