Consists of a rubber tube, approx. one meter long, fitted with a rubber cork and is held rigidly at its top in the bracket of a vertical stand. The stand has levelling screws on its base to ensure a level surface for conducting the experiment. A hook is attached to the lower end of the tube to carry the slotted weights. A pointer attachment, also at the base of the tube, is used to measure the extension of the tube on application of load with the help of a meter scale which is fitted to the stand. Supplied without slotted weights.