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
Janka Kupala National Theatre donations of citizens. In 1944 has been renamed in honour of classic of the Belarusian literature, poet Janka Kupala. Janka Kupala National Theatre Janka Kupala National Theatre (, Minsk) is the oldest theatre of Belarus. Also, the theatre is an object of cultural heritage of Belarus. The building of the theatre was built in 1890 by the project of architects Konstantin Vvedenski and Korol' Kozlovskiy. The main facade looks out onto the square formed by the intersection of Karl Marx and Engel'sa Street. The theatre was opened on September 14, 1920, and it is located in a building of the