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.
TexasâIndian wars. The Apache Wars were a series of armed conflicts between the United States Army and various Apache nations fought in the southwest between 1849 and 1886, though minor hostilities continued until as late as 1924. The United States inherited conflicts between settlers and Apache groups when Mexico ceded territory after the MexicanâAmerican War in 1846. These conflicts continued as new United States citizens came into traditional Apache lands to raise livestock, crops and to mine minerals ...