Janka hardness test understand which woods are harder than others. 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
Walter Janka judgement against him. At the same time a legal and journalistic displute flared between Janka and Wolfgang Harich about the details of those 1957 show trials. Janka's contribution to dramaturgy received recognition in the form of the Heinrich Greif Prize in 1990. On 16 December 1989 Janka was a member of the presidium at the of the SED (then in the process of transforming itself into the PDS / Party of Democratic Socialism / " Partei des Demokratischen Sozialismus") held in Berlin at the Dynamo Sports Hall. In 1990 he was a member of the "Council of Elders" of the