Mass Spectrometer 9 (MS-9) in use at the Humble Oil and Refining Company Research and Development Division laboratory located in Baytown, Texas. At left, Henry Earle Lumpkin (Mass Spectrometrist) is seated at the operating console while Electronics Technician "Jug" Daniels stands to the right.
Manufactured in Manchester, England by Associated Electrical Industries (AEI), this MS-9 was the first installed in the United States. At Humble, it was used to identify complex hydrocarbon, sulfur, nitrogen, and oxygen compounds in petroleum through accurate measurement of mass in parts per million.
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“Mass Spectrometer 9 (MS-9) in Use at Humble Oil and Refining Company,” 1964. Henry Earle Lumpkin Photograph Collection, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/000000107.
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