Date: | 1926 |
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Description: | Dr. Stephen Babcock with an electric centrifuge butterfat tester. |
Date: | 1913 |
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Description: | Four men gathered over agriculture work. Original caption reads: "Assistant County Superintendent Calley explaining corn testing work to the school directo... |
Date: | 1868 |
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Description: | Stereograph of Increase Lapham examining a fragment of a meteorite. |
Date: | 1949 |
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Description: | A man stands over a device, which he is inspecting. Caption reads: "Madison, Wis. 1949(?). Prof. Oliver P. Watts, retired distinguished authority on the co... |
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