A letter from Arnold O. Beckman to Fred T. Williams, a patent advisor at the National Defense Research Committee. In this letter, Beckman reports on the delay in filing a patent for his carbon monoxide detecting "apparatus." This instrument would eventually become an important part of Beckman's fight against air pollution.
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Beckman, Arnold O. “Letter from Arnold Beckman to Fred T. Williams,” March 7, 1944. Beckman Historical Collection, Box 16, Folder 20. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/cf95jb44s.
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