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 Carlo Janka Carlo Janka (born 15 October 1986) is an alpine ski racer from Switzerland. Born in Obersaxen, in the canton of Graubünden, he had the winter sports facilities right in front of his home. Janka has won gold medals at both the Winter Olympics and the World Championships, as well as one World Cup overall title, one discipline title and also, one unofficial alpine combined title. In 2013, Janka set a World Cup speed record in the downhill part of the super combined event in Wengen, Switzerland. He reached a maximum speed of on the "Haneggschuss", the fastest section