TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: No Known Copyright TI - Control panel for compressors in Urea Plant ID - hm50tr80w DA - 1926/04// YR - 1926 AV - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 1 VL - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 1 AN - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 1 UR - https://digital.sciencehistory.org/works/hm50tr80w AB - General view of the control panel for compressors at the Fixed Nitrogen Research Laboratory's Urea Plant. In the production of fertilizer, liquid carbon dioxide and liquid ammonia are commonly combined under high-pressure to produce Urea, a water-soluble powder form of carbonic acid frequently used as a fertilizer and feed supplement. The individual visible in the photograph is identified as Mr. H.C. Hetherington. 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. KW - Nitrogen fertilizer industry KW - Nitrogen--Fixation KW - United States. Bureau of Chemistry and Soils KW - United States. Department of Agriculture KW - Employees KW - Scientific apparatus and instruments KW - Machinery LA - ER -