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
Carlo Janka February, interrupting accessory electrical pathways to the heart. These unnecessary extra pathways had caused his heart rate to behave abnormally during exercise and stress, posing possibly severe risks. Janka recovered well from the catheterization and resumed training five days later, winning the giant slalom at Kranjska Gora, Slovenia, on 5 March for his sole victory of the 2011 season. Janka switched equipment following the 2014 season, from Atomic to Rossignol. ^ Carlo Janka Carlo Janka (born 15 October 1986) is an alpine ski racer from Switzerland. Born in Obersaxen, in the canton of Graubünden, he had the winter sports facilities