Magnesium, a baby among structural metals, is growing up fast. As evidence, last week hundreds of magnesium products were put on display at the International Magnesium Exposition in Washington's cavernous National Guard Armory. Two-thirds the weight of aluminum, magnesium had comparatively few uses before World War II, was produced in the U.S. only by Dow Chemical Co. (from sea water). Then production of airplanes, which made the lightness and strength of the metal a necessity for many parts, boosted magnesium output to a peak of 183,584 tons in 1943. After war's end...
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