Janka hardness test Janka hardness test The Janka hardness test (from the Austrian-born emigrant Gabriel Janka, 1864-1932) measures the resistance of a sample of wood to denting and wear. It measures the force required to embed an diameter steel ball halfway into a sample of wood. A common use of Janka hardness ratings is to determine whether a species is suitable for use as flooring. The hardness of wood varies with the direction of the wood grain. Testing on the surface of a plank, perpendicular to the grain, is said to be of "side hardness". Testing the cut surface of a stump is
Carlo Janka of the classic Lauberhorn slope, on 18 January. Janka competed in his first international FIS race in December 2001 at age 15. Not until four years later did he reach the podium, but success came in all four disciplines. Janka began racing on the FIS European Cup circuit in January 2004. He earned his first two World Cup starts in December 2005, but did not finish either race. At the 2006 Junior World Championships in Mt. Ste. Anne, Quebec, Canada, he won the bronze medal in giant slalom, and he finished the 2007 season in fourth place in the overall