<div class="description">
Two sets of mortar and pestles belonging to Georg Bredig (1868-1944). The larger is made of white porcelain and the smaller is made from agate. Mortar and pestles are used to manually grind or crush a sample into a fine powder. Agate is harder and less porous compared to porcelain and reduces the number of impurities introduced to a sample during the grinding process.</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/o38s1jz">Record in source catalog</a></li>
<li>DPLA identifier: <a rel="nofollow" class="external text" href="https://dp.la/item/ee6d0252453ce429f24c8d03e3ba32ae">ee6d0252453ce429f24c8d03e3ba32ae</a></li>
<li>Science History Institute identifier: padig:SHI-o38s1jz</li></ul></span>