Indentation hardness test, performed with either 3 gf or 9 gf loads, preceded the development of microhardness testers using traditional indenters. In 1925, Smith and Sandland of the UK developed an indentation test that employed a square-based pyramidal indenter made from diamond. They chose the pyramidal shape with an angle of 136° between opposite faces in order to obtain hardness numbers that would be as close as possible to Brinell hardness numbers for the specimen. The Vickers test has a great advantage of using one hardness scale to test all materials.The first reference to the Vickers indenter with low loads was made
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