The letter requests deliverables of 100 feet of silvered film, and two 10 foot pieces with a silver coating on emulsion film and clear stock.
Lee de Forest (1873–1961) was an inventor, most notably of Audion vacuum tubes in the early twentieth century. His serial business ventures included work in radio, telegraphy, telephony, broadcasting, and film.
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De Forest, Lee. “Letter from Lee De Forest to Arnold O. Beckman,” September 9, 1931. Beckman Historical Collection, Box 1, Folder 17. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/9306sz92t.
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