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 was a tribe of the Southwest, especially Arizona, New  Mexico and Texas as well as northern Mexico. These hunters/warriors  were always on the move and needed simâ¦ple, easy to construct  housing. Most Apache lived in wickiups which were simple wooden  frames covered with brush or a buffalo hide.