Science and invention in Birmingham pen nibs per week. 1915: William Mills develops the first "safe grenade" meaning it is safe for the soldier throwing it rather than his opponent. It is named the Mills bomb, and is adopted by the British Army as its standard hand grenade in 1915. 75,000,000 grenades are supplied during The Great War. 1918: Much work is carried out by Oliver Lucas's company on the design and improvement of the military search light, he also designs a signalling lamp after experiences at the Somme and the design is later used by the British Army. 1920: Charles Henry Foyle invents the
Iron mining in the United States produced 3.66 billion tons of ore, about 70 percent of which came from the Mesabi Range. Totals through 1965 were: The largest production of US iron ore outside the Great Lakes districts was the Birmingham, Alabama district. Sedimentary iron ore in the Red Mountain formation of Silurian age was first used to make iron in 1864. Production was small until 1881, when major steelmaking began in Birmingham. The last iron mine shut down in 1975, after the district had produced 376 million long tons of ore. Iron mining in the United States Iron mining in the United States produced 42.5