Episode of The March of Time released in 1945 as U.S. Army educational film # EF-221, Science In Business.
"Reel 1 briefly describes early studies and experiments in geometry, chemistry, and electricity. Shows the pyramids. Describes the melting of metal in a foundry, the machining of tungsten, use of light metals in aircraft production, the generation of electricity by sunlight, and Dr. Langmuir's experiments with oil film.

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