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Digital Collections

Photographs, Negatives (Photographs)

Leo Ruhnau conducting acid analysis in Dow Chemical Company laboratory

  • 1944

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General view of technician Leo Ruhnau using an apparatus to determine the percentage of hydrochloric acid in Dowell acids at a Dow Chemical Company laboratory.

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  • 4 in. H x 5 in. W
Subject
Rights No Known Copyright
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  • Courtesy of Science History Institute

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  • Box 7, Folder Plants--Main Laboratory (Old)

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Dow Chemical Company. “Leo Ruhnau Conducting Acid Analysis in Dow Chemical Company Laboratory,” 1944. Dow Chemical Company Historical Image Collection, Box 7, Folder Plants--Main Laboratory (Old). Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/mk61rh48m.

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The Science History Institute recognizes there are materials in our collections that may be offensive or harmful, containing racist, sexist, Eurocentric, ableist, or homophobic language or depictions. The history of science is not exempt from beliefs or practices harmful to traditionally marginalized groups. The Institute is engaged in ongoing efforts to responsibly present and address the evidence of oppression and injustice inextricable from the history of science. If you would like to learn more about our ongoing efforts or if you encounter harmful, inaccurate, or insufficient descriptions, please contact us at digital@sciencehistory.org.