Barcol hardness test the Barcol impressor was developed by Walter Colman as a hand-held, portable means of assessing the hardness of a material during World War II. The United States Army Air Corps required a hand-held method of checking the hardness of rivets due to concerns that aircraft could be sabotaged by replacing normal rivets with soft lead or wooden ones which would fail during flight. The impressor operates when the tip is pressed against the material in question. The hardness of the material determines how far the tip indents and this is transferred by a tension spring and lever to be read
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