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.
Les Apaches was a Parisian Belle Ãpoque violent criminal underworld subculture of early 20th-century hooligans, night muggers, street gangs and other criminals. After the news about their notoriety spread over Europe, the term was used to describe violent street crime in other countries as well; for example, Russian apaches.