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
Janka-Puszta Janka-Puszta Janka-Puszta or Jankovac was a training camp set up for the Ustashe terrorist organisation in 1931. The camp was located in the Zala County of Hungary, close to the border of the then Kingdom of Yugoslavia near the villages of Murakeresztúr and Belezna. The camp was one of a string of training camps established in Hungary and Italy by the Ustashe. It housed several hundred émigré recruits, mostly manual laborers returning from Western Europe and North America. The recruits swore an oath of loyalty to the leader of the Ustashe, Ante Pavelić, took part in militant exercises, and produced