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 women's tour at Lake Louise, winning two races and narrowly missing a third win. On 16 January 2010, Janka won the Lauberhorn downhill in Wengen, the longest and fastest race on the World Cup tour, a day after nearly repeating his 2009 win in the super-combined by narrowly placing second behind Bode Miller. On 23 February 2010, Janka won the gold medal in the giant slalom at the 2010 Vancouver Olympics at Whistler Creekside in Whistler, British Columbia, Canada. At the World Cup finals in Garmisch, Germany, in March 2010, he became the fourth Swiss racer to win the World