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
Les Janka Legislative and Public Affairs in 1974. He moved to the Pentagon in 1976 as Deputy Assistant Secretary of Defense for Near Eastern and African Affairs. Between 1978 and 1982, he worked for DGA International, a consultant assisting European corporations in marketing advanced military technology to the Pentagon. In 1984, after serving in the White House as Deputy Press Secretary for Foreign Affairs under President Ronald Reagan, he founded the Council for American-Saudi Dialogue, a foreign policy lobbying and public affairs consulting firm. Les Janka Leslie A. Janka is President-Saudi Arabia for Quincy International LLC, resident in Riyadh Saudi Arabia.. He