The Rockwell hardness tester to measure the hardness of metal measures resistance to penetration like the Brinell test, but in the Rockwell case, the depth of the impression is measured rather than the diametric area. With the Rockwell tester, the hardness is indicated directly on the scale attached to the machine.
(Redirected from Apache Nation) The Apache (/ÉËpÃ¦tÊiË/; French: [a.paÊ]) are culturally related Native American tribes from the Southwestern United States, and have traditionally lived in Eastern Arizona, Northern Mexico (Sonora and Chihuahua), New Mexico, West Texas, and Southern Colorado.
The name Apache is a Spanish corruption of Apachii, a ZuÃ±i word meaning enemy.. Federally recognized contemporary Apache tribal governments are located in Arizona, New Mexico, and Oklahoma. Apache reservations are also located in Arizona and New Mexico. In Oklahoma, the Apache land was allotted in severalty under the General Allotment Act of 1887 (also known as the Dawes Act); Oklahoma Apaches became citizens of the new state of Oklahoma and of the United States in 1907.