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 Apache are natives of the Southwest deserts (particularly in Arizona, New Mexico, and Texas). Some Apache people were also located across the border in northern Mexico. One Apache band, the Na'ishan or Plains Apache, lived far away from the other Apaches, in what is now Oklahoma. Their customs were different from other Apaches, more similar to their Kiowa allies. For that reason, the Americans often called the Na'ishan Kiowa-Apaches..