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
Marble Rocks one side to another. This gave the Gorge its local name- Bandar Kudni (meaning- Monkey's jumping place). The white marbles are predominantly rich in magnesium and are closer in hardness to soap stone. This softness allows them to be carved. The area also contains blue and brown colored marble. The area has many tourist activities. There is a cable car to take visitors across the gorge, row boats for guided tours of the river downstream of the falls, and many small shops filled with crafts made from the local materials. Marble Rocks The Marble Rocks is an area along the