The paper, distributed as a reprint from Beckman Instruments, described the IR-3 spectrophotometer. It was originally presented before the Symposium on Molecular Structure and Spectroscopy, held in Columbus, Ohio at Ohio State University on June 17, 1949.
Cary, H. Howard (Henry Howard), George H. Hare, R. G. Madsen, M. E. Stickney, Arnold O. Beckman, and R. C. Hawes. “A Direct Transmittancy Recording Infrared Spectrophotometer,” n.d. Beckman Historical Collection, Box 17, Folder 38. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/h989r3709.