Rockwell scale Rockwell scale The Rockwell scale is a hardness scale based on indentation hardness of a material. The Rockwell test determines the hardness by measuring the depth of penetration of an indenter under a large load compared to the penetration made by a preload. There are different scales, denoted by a single letter, that use different loads or indenters. The result is a dimensionless number noted as HRA, HRB, HRC, etc., where the last letter is the respective Rockwell scale (see below). When testing metals, indentation hardness correlates linearly with tensile strength. This important relation permits economically important nondestructive testing of
Orient Hotel, The Rocks of The Rocks under SCRA erupted in 1973 in organised community protests supported by the NSW Branch of the Builders Labourers' Federation. By 1975, SCRA's planning outlook had evolved to take into consideration cultural, social and historical values, but large scale developments continued. The Orient Hotel with its corner location and historic street presentation has contributed to the public's association of The Rocks with a unique historic neighbourhood. Around 1976, a company named Rocks Hotels Pty Ltd. took on the management of the hotel and in 1979 extensive alterations valued at $120,000 were completed to provide street facades approximating its