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Start Over You searched for: Date 1930 to 1939 Remove constraint Date: <span class="from" data-blrl-begin="1930">1930</span> to <span class="to" data-blrl-end="1939">1939</span>-
Equipment for treating fertilizer raw materials with nitrogen oxides
- 1930-Jan-08
Equipment used to treat raw materials for the production of fertilizer with nitrogen oxides at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The Fixed Nitrogen…
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Dr. Burk and Mr. Lineweaver with microapparatus for studying bacterial nitrogen fixation
- 1930-Jan-08
General view of the microapparatus and assorted laboratory equipment used to study bacterial nitrogen fixation at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.…
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Carbon dioxide drier, compressor, liquifier, and liquid storage
- 1930-Jan-08
General view of a carbon dioxide drier, compressor, liquifier, and liquid storage used at the Fixed Nitrogen Research Laboratory's Urea Plant. Urea is a water-soluble powder form of carbonic acid frequently used as a…
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Assembly of apparatus for sterile plant cultures
- 1930-Jan-08
Close-up view of the assembly of an apparatus used for sterile cultures of taller green plants at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The Fixed Nitrogen…
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Apparatus for studying the mechanism of nitrogen fixation
- 1930-Jan-08
General view of an apparatus used for the spectroscopic study of the mechanism of nitrogen fixation in the electric arc at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington,…
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Apparatus for studying the absorption spectrum of ozone
- 1930-Jan-08
General view of an apparatus used to study the absorption spectrum of ozone in visible and photographic infra red. This apparatus was used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory…
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Apparatus for studying the absorption spectrum of ozone
- 1930-Jan-08
Close-up view of an apparatus used to study the absorption spectrum of ozone in visible and photographic infra red. This apparatus was used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory…
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Apparatus for determining the solubility of gases in water
- 1930-Jan-08
General view of an apparatus used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory to determine the solubility of gases in water at various temperatures and pressures up to 1,000 atmospheres.
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