TY - MANSCPT DB - Science History Institute DP - Science History Institute M2 - Courtesy of Science History Institute. Rights: No Known Copyright TI - Air-conditioning equipment at Fertilizer Machinery Laboratory ID - 7w62f8234 DA - 1935/// YR - 1935 AV - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 4 VL - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 4 AN - Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 4 UR - https://digital.sciencehistory.org/works/7w62f8234 AB - General view of the air-conditioning equipment used in the U.S. Department of Agriculture's Fertilizer Machinery Laboratory located at the Arlington Experimental Farm in Rosslyn [Arlington], Virginia. This particular equipment was used to control temperature and relative humidity in the laboratory's fertilizer distributor testing room. Established by an act of Congress in April 1900, Arlington Farm served as the main field laboratory for the Bureau of Soils, U.S. Department of Agriculture, until 1941. KW - Nitrogen fertilizer industry KW - United States. Bureau of Chemistry and Soils KW - Air conditioning KW - United States. Department of Agriculture KW - Machinery LA - ER -