Hardness test is Mohs scale, which is used in mineralogy. One tool to make this measurement is the sclerometer. Another tool used to make these tests is the pocket hardness tester. This tool consists of a scale arm with graduated markings attached to a four-wheeled carriage. A scratch tool with a sharp rim is mounted at a predetermined angle to the testing surface. In order to use it a weight of known mass is added to the scale arm at one of the graduated markings, the tool is then drawn across the test surface. The use of the weight and markings
182 Cumberland Street, The Rocks slope. As at 26 June 2002, this shop and residence and site are of State heritage significance for their historical and scientific cultural values. The site and building are also of State heritage significance for their contribution to The Rocks area which is of State Heritage significance in its own right (see item no. 4500458). The building is part of the Rocks Conservation Area and, as such, contributes to the overall character and interpretation of the area. It is one of the few remaining corner shops and residences within the area. It is representative of government-designed worker housing from the