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
Ahmed Janka Nabay Ahmed Janka Nabay Ahmed Janka Nabay (January 5, 1964 – April 2, 2018) was a Sierra Leonean musician and a major figure in Bubu Music, a traditionally Temne music which is played by up to 20 musicians blowing into bamboo pipes of different sizes. He first earned attention after performing for an audition of SuperSound. Janka Nabay recorded his album in Forensic Studios in Freetown during the Sierra Leonean Civil War. Since moving to Washington, D.C. in 2003, Janka Nabay has continued to play bubu music, including a performance at the CMJ College Music Marathon in New York in 2009