De Forest inquires about Beckman's progress toward a chemical coating that might change in opacity or color, and details the "very fine and uniform quality" of silver coated film de Forest is able to produce.
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.
|Place of creation|
|Original file type||TIFF|
|Rights||In Copyright - Rights-holder(s) Unlocatable or Unidentifiable|
|View in library catalog|
De Forest, Lee. “Letter from Lee De Forest to Arnold O. Beckman,” October 22, 1931. Beckman Historical Collection, Box 1, Folder 17. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/j9602142v.
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