TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: No Known Copyright TI - Mr. Liddel with infrared spectrograph at Fixed Nitrogen Research Laboratory ID - s4655g667 DA - 1930/01/08/ YR - 1930 AV - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 2 VL - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 2 AN - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 2 UR - https://digital.sciencehistory.org/works/s4655g667 AB - 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 and continuous light sources, as well as a slit and thermocouple plate. An individual identified as Mr. Liddel is seen adjusting the galvanometer located inside of a box shielded from thermal and electrical currents. 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 - Infrared spectroscopy KW - United States. Department of Agriculture KW - Employees KW - Scientific apparatus and instruments LA - ER -