Constant Humidity Room at the Fertilizer Machinery Laboratory
- Circa 1935
General view of assorted equipment and apparatus in the Constant Humidity Room at the the U.S. Department of Agriculture's Fertilizer Machinery Laboratory located at the Arlington Experimental Farm in Rosslyn [Arlington], Virginia. Various pieces of equipment have been labelled with letters to create an identification key. Per the key, the equipment is identified as follows: C) Receiving tray; D) Fertilizer distributor; E) Fertilizer drawer; F) Hygrothermograph; G) Revolution or speed counter; H) Dust curtain.
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.
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Cite as
“Constant Humidity Room at the Fertilizer Machinery Laboratory,” circa 1935. Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 4. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/q237hr95t.
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