Sodium nitrate for gunpowder. Worker using a scoop to move sodium nitrate at an industrial site for the production of gunpowder (also known as blasting powder or black powder). Sodium nitrate is one of three ingredients used. The others are sulphur and charcoal (see C018/0681). This stage is where the sodium nitrate is unloaded, screened and weighed. This site is part of the DuPont Belin factory, near Scranton, Pennsylvania, USA. This image dates from around the 1940s.
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