Word: alloys
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...maneuverability, especially on quickly built temporary landing fields. The Army explains that it is not yet ready for wooden combat planes, is meanwhile ordering more & more wooden primary trainers, has available a design for an advanced trainer in which priority precious metals may be replaced by wood and low-alloy steel...
...After years of experiment, ingenious North American Aviation has found a low-carbon, low-alloy steel suited for airplane wings, stabilizers, rudders, elevators, flaps and ailerons. Combined with a plywood fuselage, it makes a top-notch combat trainer, weighing only 3% (150 lb.) more than an aluminum ship. The aluminum saved on 1,000 steel-plywood jobs would make 420 sleek pursuit ships...
...Magnetic forces keep the molten metal stirring about, so that the several components of an alloy remain well mixed...
...High-alloy steel for tanks was scarce in 1941. But the end of passenger-car production releases 600-650,000 tons of such steels, nearly 50% of 1940 output...
...zinc and tin now used to galvanize and tin-plate iron and steel. With ordinary electroplating equipment, a thin film of nickel is first deposited on the metal, then a layer of zinc or tin much thinner than usual is added. Baking then fuses the two coats into an alloy whose exceptional resistance to rust and corrosion has already been demonstrated on wire screens, and on Sears, Roebuck's insecticide spray tanks. Even though small amounts of nickel are required, the net result is a goodly saving in scarce metals...