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Interior view of fertilizer apparatus
- 1950s
Close-up view of the interior of an apparatus likely used for the manufacture and/or testing of fertilizer at an unidentified U.S. Department of Agriculture facility.
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2 items
Students' Potentiometer
- 1950s
Potentiometers are used to measure electromotive force (emf) by balancing it with a known emf. The concept was first developed in 1841 by J. C. Poggendorff and improved throughout the 19th century by Latimer Clark and…
- Manufacturer Leeds and Northrup Company
- Subject Potentiometer, Leeds and Northrup Company
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Double flask for demonstrating anaerobic fermentation
- 1939 – 1967 (Date span attributed to photograph)
Photograph of a double flask used by French biologist, microbiologist, and chemist Louis Pasteur (1822-1895) to demonstrate anaerobic fermentation, as displayed at the Pasteur Institute in Paris. Per notations…
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Evelyn Photoelectric Colorimeter
- 1950 – 1959
Wooden box with metal instrument panel on top; four small black rubber feet on bottom; front of wooden box contains printed instructions and folds down to show inside of instrument; rectangular wooden area attached to…
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Autoclave at the Aeronautical Materials Laboratory
- 1950s – circa
General view of an autoclave, used for the fabrication of plastics, at the Naval Air Engineering Center's Aeronautical Materials Laboratory. In the foreground, Laboratory Technical Director J. Hartley Bowen, Jr.…
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Research Laboratory at Althouse Chemical Company plant
- 1951
General view of the Research Laboratory at the Althouse Chemical Company plant in Reading, Pennsylvania showing various equipment and apparatus used for the production and testing of dyestuffs.
Based in Reading,…
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Research Laboratory at Althouse Chemical Company plant
- 1951
General view of the Research Laboratory at the Althouse Chemical Company plant in Reading, Pennsylvania showing various equipment and apparatus used for the production and testing of dyestuffs.
Based in Reading,…