Original Caption: 'A spring tyne testing machine: 1926' Description: The 'Brinel' hardness tester used for testing the hardness of the spring tyne. The machine puts a ball indent in the material and the instrument held in the operator's left hand is used to measure the diameter of the indent. The hardness is then determined by reference to a 'standards scale'. Location Devonshire Road Melbourne; Sunshine Victoria Australia Earliest Date 1926 Latest Date 1926 Image No 011223