View of a combination hot plate and shaker used to investigate potash at the U.S. Department of Agriculture's Fixed Nitrogen Research Laboratory located in Washington, D.C. Potash salts are an important component in the production of fertilizer and laboratory investigations were commonly undertaken to develop cost-effective measures to recover and convert potash salts that occur in nature into soluble form.
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“Combination Hot Plate and Shaker,” January 8, 1930. Travis P. Hignett Collection of Fixed Nitrogen Research Laboratory Photographs, Box 1. Science History Institute. Philadelphia. https://digital.sciencehistory.org/works/7s75dc50s.
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