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
93 George Street, The Rocks development of The Rocks. The site has scientific significance for the archaeological potential to reveal evidence of road surfaces and earlier buildings on the site. The building is socially significant for its long history, and for its contribution to The Rocks area, Australia's premier heritage precinct. Shop, Zia Pina Pizzeria was listed on the New South Wales State Heritage Register on 10 May 2002 having satisfied the following criteria. The place is important in demonstrating the course, or pattern, of cultural or natural history in New South Wales. The site of 91 and 93 George Street is historically significant as