Search Results
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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…
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Investigation of thermionic emission of positive ions
- 1930-Jan-08
General view of an apparatus used to investigate the thermionic emission of positive ions from platinum films sputtered on glass at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…
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Decomposition chamber for the thermal decomposition of ammonia
- 1928-Aug-21
Close-up view of a decomposition chamber used to facilitate the thermal decomposition of ammonia on tungsten, molybdenum, nickel, and iron catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research…
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Apparatus for studying the decomposition of ammonia
- Circa 1927-Jul-26
R.A. Nelson (left) and E.S. Lamar (right) demonstrating an apparatus used to study the decomposition of ammonia on hot catalyst surfaces by means of the coated strip method. This apparatus was used at the U.S.…
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Apparatus for studying the decomposition of ammonia
- Circa 1927-Jul-26
Close-up view of an apparatus used to study the decomposition of ammonia on hot catalyst surfaces by means of the coated strip method. This apparatus was used at the U.S. Department of Agriculture's Fixed Nitrogen…
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Study of the decomposition of ammonia on catalyst surfaces
- 1926-Apr
R.A. Nelson (left) and Dr. C.H. Kunsman (right) demonstrating an apparatus used to study the decomposition of ammonia on catalyst surfaces at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory…
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Apparatus for measuring thermionic properties
- 1926-Apr
General view of an apparatus used to measure the thermionic properties of catalyst surfaces at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. In chemistry, the term…
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Apparatus for testing water gas catalysts
- 1926-Apr
J.F. Shultz demonstrating use of an apparatus to test water gas catalysts at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The term "water gas" commonly refers to…
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Removal of carbon dioxide from water gas
- 1926-Apr
M.C. Molstad demonstrating use of an apparatus for the removal of carbon dioxide from water gas by means of scrubbing under pressure at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in…
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Apparatus for the emission of positive ions
- 1926-Apr
General view of an apparatus used for the emission of positive ions at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. The individuals present in the photograph are…
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Apparatus for measuring the effect of radiation
- 1926-Apr
General view of an apparatus used to measure the effect of radiation on chemical reactions 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 activity of potassium ions and electrons
- 1928-Aug-21
General view of an apparatus used to study the relative activity of potassium ions and electrons in the synthesis of ammonia from nitrogen and hydrogen gas at the U.S. Department of Agriculture's Fixed Nitrogen Research…
