Scratch hardness Scratch hardness Scratch hardness tests are used to determine the hardness of a material to scratches and abrasion. The earliest test was developed by mineralogist Friedrich Mohs in 1820 (see Mohs scale). It is based on relative scratch hardness, with talc assigned a value of 1 and diamond assigned a value of 10. Mohs' scale had two limitations; it was not linear, and most modern abrasives fall between 9 and 10. Raymond R. Ridgway, a research engineer at the Norton Company, modified the Mohs scale by giving garnet a hardness of 10 and diamond a hardness of 15. Charles E.
Neonatal Behavioral Assessment Scale supposed to assess the "infant's role in the mother-infant social relationship" from which high scores are supposed to presume "high levels of intelligence.". Therefore, the value of the test is as a research tool and a supplement test to medical testing procedures. But as a predictor of future intelligence, it is very unsatisfactory. Because of this, some wonder what the scale is really measuring. Training is necessary for effective and reliable administration of the NBAS. Neonatal Behavioral Assessment Scale The Neonatal Behavioral Assessment Scale (NBAS), also known as the Brazelton Neonatal Assessment Scale (BNAS), was developed in 1973 by Dr.