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.
CHAPTER I. INDIANS OF ARIZONA. THE APACHE. Indians of ArizonaâApacheâFirst Mention of â Tribal Groups â Aravaipa â ChiricahuaâApache Language Same as Tartar ChineseâCoyoteros â Pinal Coyoteroâ PinaleÃ±osâTontosâSan Carlos Apache âGila ApacheâMogollonâMimbrenos â White MountainâTsiltaden. This volume is devoted entirely to the Indians of Arizona. Before 1866 and 1867, many of the Apache tribes were unknown and a large part of their country was a terra incognita.