General view of Clara Kellerman and another unidentified employee inspecting electric blasting cap shells at the Hercules Powder Company plant in Port Ewen, New York. Formed in 1912 as part of an anti-trust settlement with DuPont, the Hercules Powder Company (later Hercules Inc.) specialized in the manufacture of explosives and smokeless powders. During World War II, the company's Port Ewen plant produced a range of special detonators designed for military use.
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Hercules Incorporated. “Shell Inspection at Hercules Port Ewen Plant,” March 1945. Photographs from the Records & Ephemera of Hercules Incorporated, Box 2, Folder 36. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/q237hs420.
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