Pictures and Illustrations

Spectrophotometer.

Photo of spectrophotometer from “The Development of a Spectrophotometric Carbon Monoxide Indicating Instrument Using Hemoglobin,” by Linus Pauling, National Defense Research Committee of the Office of Scientific Research and Development, OSRD No. 1885. June 1943

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Source: Ava Helen and Linus Pauling Papers. Science, 13.006.2

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