A note on the back indicates that this is a "precision adjustment." Steve Murphy was the supervisor of National Technical Laboratories' infrared assembly department.
The Beckman Instruments IR spectrophotometers began as a request from the Office of Rubber Reserve to Arnold O. Beckman in 1942, asking for an infrared spectrophotometer that they could use to create rubber. Under this contract, Beckman Instruments developed a single-beam spectrophotometer based on Robert Battrain’s extant design, which in 1942 was sold as the IR-1. With the IR-4 in 1956, Beckman Instruments branched out into double-beam design and kicked off a golden age of IR spectrophotometer production that lasted until 1973.
|View in library catalog|
“Steve Murphy Adjusting a Beckman IR-2A Spectrophotometer,” 1950–1959. Beckman Historical Collection, Box 55, Folder 54. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/00000009g.
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