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. Equipment visible in the photograph include a Warburg-Bancroft microrespiration apparatus, a micro-Kjeldahl distilling apparatus, multiple gas-mixing flowmeter, nephelometer, and bacterial culture bottle. The individuals present in the photograph are identified as Dr. Burk (left) and Mr. Lineweaver (right).
The Fixed Nitrogen Research Laboratory (F.N.R.L.) was established at American University in 1919 under the directorship of Arthur B. Lamb. Initially part of the War Department, the F.N.R.L. was the successor to several wartime initiatives to develop a secure domestic supply of nitrate compounds necessary for the manufacture of explosives during World War I. With a staff of about 110 individuals, including 35 to 50 chemists, the F.N.R.L. focused on the manufacture, production, and development of products of atmospheric nitrogen, including munitions and fertilizers.
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“Microapparatus for Studying Bacterial Nitrogen Fixation,” January 8, 1930. Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 2. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/5999n347r.
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