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.
Since the Navajo and the other Apache groups are clearly related through culture and language, they are all considered Apachean. Apachean people formerly ranged over eastern Arizona, northern Mexico (Sonora and Chihuahua), New Mexico, west and southwest Texas, and southern Colorado.he People who are known today as Apache were first encountered by the Conquistadors of the Spanish Crown, and thus the term Apache has its roots in the Spanish language. The Spanish first used the term Apachu de Nabajo (Navajo) in the 1620s, referring to people in the Chama region east of the San Juan River.