Date: | 1926 |
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Description: | Dr. Stephen Babcock with an electric centrifuge butterfat tester. |
Date: | 1926 |
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Description: | Special Kjeldahl apparatus in Dr. Edwin B. Fred's laboratory. |
Date: | 1926 |
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Description: | Comparative infection of "yellows" in a field of alfalfa and sweet clover. |
Date: | 1926 |
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Description: | Concrete chimney experiment at the University of Wisconsin. |
Date: | 1926 |
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Description: | Engineering photograph of an experimental McCormick-Deering Farmall Regular tractor. |
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