The city of Atlanta, Georgia, in Fulton County, was an important rail and commercial center during the American Civil War. Although relatively small in population, the city became a critical point of contention during the Atlanta Campaign in 1864 when a powerful Union army approached from Union-held Tennessee.
Rare-earth compounds containing lanthanum are extensively used in carbon lighting applications, especially by the motion picture industry for studio lighting and projection.
1 Small amounts of lanthanum added to molybdenum decreases the hardness of this metal and its sensitivity to temperature variations. 2  Mischmetal, a pyrophoric alloy used e.g. in lighter flints, contains 25% to 45% lanthanum. Small amounts of lanthanum added to iron helps to produce nodular cast iron. 2  Small amounts of lanthanum added to molybdenum decreases the hardness of this metal and its sensitivity to temperature variations. 3  Mischmetal, a pyrophoric alloy used e.g. in lighter flints, contains 25% to 45% lanthanum.