TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: No Known Copyright TI - Thermostat and equipment for determining compressibility ID - bk128b01m DA - 1928/08/21/ YR - 1928 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/bk128b01m AB - General view of a thermostat and equipment used to determine the compressibility of gas at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. In chemistry, compressibility refers to the measure of how much a given volume of matter decreases when placed under pressure. At the Fixed Nitrogen Research Laboratory, this particular apparatus was used to measure the amount of gas present after expansion from a high-pressure environment. 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 - Thermostat KW - United States. Department of Agriculture KW - Scientific apparatus and instruments LA - ER -