You Searched For
Start Over You searched for: Date 1920 Remove constraint Date: <span class="single" data-blrl-single="1920">1920</span>-
Bureau of Chemistry Nitrogen Laboratory
- 1901 – before 1928
General view of an employee operating an apparatus used to study ammonia at the Bureau of Chemistry's Nitrogen Laboratory. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted investigations…
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Bureau of Chemistry Nitrogen Laboratory
- 1901 – before 1928
General view of the Bureau of Chemistry's Nitrogen Laboratory showing assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted investigations into…
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Bureau of Chemistry Nitrogen Laboratory
- 1901 – before 1928
General view of an employee conducting an analysis of an unidentified substance in the Bureau of Chemistry's Nitrogen Laboratory. Part of the U.S. Department of Agriculture, the Nitrogen Laboratory conducted…
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Bureau of Chemistry Drug Laboratory
- 1901 – before 1928
General view of two employees at work in a Bureau of Chemistry Drug Laboratory, with view of assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, such laboratories commonly…
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Agricultural Research Service Drug Laboratory
- 1901 – before 1928
General view of two employees at work in an Agricultural Research Service Drug Laboratory, with view of assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, such laboratories commonly…
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Naval Stores Investigation Laboratory
- 1901 – before 1928
General view of three employees at work in the Bureau of Chemistry's Naval Stores Investigation Laboratory, a division of the Leather and Paper Laboratory. Assorted laboratory glassware and apparatus, as well as notices…
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Bureau of Chemistry Carbohydrate Laboratory
- 1913 – before 1928
General view of the Bureau of Chemistry's Carbohydrate Laboratory showing assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, the Carbohydrate Laboratory analyzed the physical and…
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Bureau of Chemistry Carbohydrate Laboratory
- 1913 – before 1928
General view of the Bureau of Chemistry's Carbohydrate Laboratory showing assorted laboratory glassware and apparatus. Part of the U.S. Department of Agriculture, the Carbohydrate Laboratory analyzed the physical and…
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Bureau of Chemistry Water and Beverage Laboratory
- After 1901 – 1928
General view of an employee in the Bureau of Chemistry's Water and Beverage Laboratory conducting an analysis on an unidentified substance. Assorted sample jars and scientific apparatus are visible in the photograph.…
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3 items
Bausch & Lomb Abbe Refractometer Serial No. 380
- 1919 – 1926
A: Refractometer
Instrument has round cast iron base; on the base is a rectangular glass mirror mounted to allow rotation; a single black pillar supports the prism alidade, the black cylindrical telescope viewer, and…- Manufacturer Bausch & Lomb Optical Company
- Subject Bausch & Lomb Optical Company, Refractometers, Optics