
February 1942. "A battery of 1,000- and 2,000-pound furnaces roaring threats to the Axis. These are rotary oil-fired melting furnaces at Aluminum Industries Inc. Destination of the finished aluminum products is kept secret." View full size. 4x5 Kodachrome transparency by Alfred Palmer, Office of War Information.
Ya wouldn't want anyone to know we used this stuff on airplanes.