Word: coppers
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Dates: during 1940-1949
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Steel may soon replace brass in U.S. shell casings; and if it does, the substitution will cut by nearly 50% 1942's estimated copper shortage of 770,000 tons...
...years. She has stocks on hand, said the Ministry, for an all-out war for at least twelve months. Japan can probably mobilize another million men for action before it cuts seriously into her industrial production. Japan has abundant stockpiles of such key materials as chrome, tungsten, phosphates, copper, zinc. Most of these materials were purchased from the U.S. and Allied countries during the past few years. Said one U.S. soldier in the Philippines when a bomb dropped near him: "We sold 'em this stuff and now they're giving it back...
Metals. Aircraft-parts makers and other metal fabricators have been held back by the metals shortage, especially copper. So the mines of Anaconda, Phelps-Dodge and Miami last week jumped from a sixto a seven-day week. (Kennecott has operated day in, day out for more than a year.) Production increases in the first three companies alone will add perhaps 50,000 tons annually to the U.S. copper supply, an amount equal to 5% of 1940's entire U.S. production...
...much as steel, but [stainless] steel is more than four times as strong as aluminum in pull and tension. Recent developments in structure mathematics now enable us, even in small planes, to build trusses of thin stainless steel of equal weight to duralumin [an alloy containing 95% aluminum, 4% copper, ½ % manganese and ½ % magnesium while in larger ships there is a greater advantage to the steel construction...
...Copper. From the U.S. in 1938 she got 110,000 tons. She also got a lot from Chile until early this year. Her own production is about 85,000 tons a year...