Search Results
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Postage stamp commemorating German emergency aid
- 1934
Stamp issued by the "Deutsche Reich" government under Nazi rule depicting images associated with the profession of chemistry.
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Indigo
- Old as the Pyramids... New as the 20th Century
- 1937
Color print advertisement for synthetic indigo and other indigoid products manufactured and sold by the Dow Chemical Company. The advertisement features images of ancient Egyptian statues with accompanying text…
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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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Sterile culture of small phanerogams at the Fixed Nitrogen Research Laboratory
- 1930-Jan-08
Close-up view of a sterile culture of small phanerogams, also known as spermatophytes or seed plants, at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The…
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Alsike clover plant at the Fixed Nitrogen Research Laboratory
- 1930-Jan-08
Close-up view of an alsike clover plant at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Notably, the root of the plant is growing from the pedicel (i.e. the stem…
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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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Warburg-Barcroft microrespiration apparatus
- 1930-Jan-08
Close-up view of the Warburg-Barcroft microrespiration apparatus used to study bacterial nitrogen fixation at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The…
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Assorted apparatus in the Steel Corrosion Laboratory
- 1930-Jan-08
General view of assorted apparatus used in the Steel Corrosion Laboratory at the U.S. Department of Agriculture's Fixed Nitrogen Research facility located in Washington, D.C. Apparatus include a constant volume…
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Thermostat used in steel corrosion tests
- 1930-Jan-08
Close-up view of the thermostat used to maintain ammonia bubbles at sixty-five degrees Celsius during steel corrosion tests at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…
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Hydraulic pump at the Fixed Nitrogen Research Laboratory
- 1930-Jan-08
General view of the hydraulic pump used to perform steel corrosion tests at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The Fixed Nitrogen Research Laboratory…
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Employee conducting X-ray studies of catalysts for nitrogen fixation
- 1930-May-28
General view of an unidentified employee operating an apparatus used to produce x-radiation in order to study nitrogen fixation catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory…
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Driving mechanism for infrared spectrograph
- 1930-Jan-08
Close-up view of the driving mechanism of an automatic self-recording infrared spectrograph used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Features of note…
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Mr. Olmstead with ultrasonic oscillator at the Fixed Nitrogen Research Laboratory
- 1930-Jan-08
General view of Mr. Olmstead. operating an ultrasonic oscillator used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Visible components of the oscillator include…
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Apparatus for studying photoelectric emissivity
- 1930-Jan-08
Close-up view of an apparatus used to study the photoelectric emissivity of catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Emissivity is a measure of the…
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Investigation of chemical action in glow discharge
- 1930-Jan-08
General view of a laboratory facility and apparatus used to investigate the chemical activity evident in glow discharge at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington,…
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Ultrasonic oscillator with soil suspension
- 1930-Jan-08
Close-up view of an ultrasonic oscillator with a soil suspension and view of the driving transformer and oil bath containing piezoelectric quartz crystal. This oscillator was used at the U.S. Department of Agriculture's…
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Apparatus for the production of soft x-radiation
- 1930-Jan-08
Close-up view of an apparatus used to produce soft x-radiation at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The Fixed Nitrogen Research Laboratory (F.N.R.L.)…
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Apparatus for obtaining x-ray diffraction patterns
- 1930-Jan-08
Close-up view of an apparatus used to obtain x-ray diffraction patterns at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The Fixed Nitrogen Research Laboratory…
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Front lateral view of infrared spectrograph
- 1930-Jan-08
Front lateral view of an infrared spectrograph used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Visible components of the spectrograph include the thermocouple…
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Mr. Liddel with infrared spectrograph at Fixed Nitrogen Research Laboratory
- 1930-Jan-08
View of the front of an infrared spectrograph used at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Visible components of the spectrograph include the mercury arc…
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Lime glass tube
- 1930-Jan-08
Close-up view of a lime glass tube, part of an apparatus used to investigate the thermionic emission from platinum films sputtered on glass 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 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 activation of gases
- 1930-Jan-08
Close-up view of an apparatus used to study the activation of gases by bombardment with positive ions at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C.
The Fixed…