<div class="description">
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.</div>
This file was contributed to Wikimedia Commons by <a href="https://en.wikipedia.org/wiki/en:Science_History_Institute" class="extiw" title="w:en:Science History Institute"><span title="library, museum, and archive in Philadelphia, United States">Science History Institute</span></a> as part of a cooperation project. The donation was facilitated by the <a href="https://en.wikipedia.org/wiki/Digital_Public_Library_of_America" class="extiw" title="w:Digital Public Library of America">Digital Public Library of America</a>, via its partner PA Digital.<span style="text-align:left">
<ul><li><a rel="nofollow" class="external text" href="https://digital.sciencehistory.org/works/7s75dc50s">Record in source catalog</a></li>
<li>DPLA identifier: <a rel="nofollow" class="external text" href="https://dp.la/item/b90fe58a8ee884b47561157547c94359">b90fe58a8ee884b47561157547c94359</a></li>
<li>Science History Institute identifier: padig:SHI-7s75dc50s</li></ul></span>