Engraving of <a href="https://en.wikipedia.org/wiki/Andreas_Sigismund_Marggraf" class="extiw" title="en:Andreas Sigismund Marggraf">en:Andreas Sigismund Marggraf</a>, flipped so he is facing left
Unknown author<span style="display: none;">Unknown author</span>
circa 1770 <div style="display: none;">date QS:P,+1770-00-00T00:00:00Z/9,P1480,Q5727902</div>
Scanned from <cite class="book" style="font-style:normal" id="CITEREFWeeks1933">Weeks, Mary Elvira (1933) "III. Some Eighteenth-Century Metals" in    <i> The Discovery of the Elements</i>, Easton, PA:  Journal of Chemical Education, p. 20  <small><a href="https://en.wikipedia.org/wiki/International_Standard_Book_Number" class="extiw" title="en:International Standard Book Number">ISBN</a>:  <a href="//commons.wikimedia.org/wiki/Special:BookSources/0766138720" title="Special:BookSources/0766138720">0766138720</a>. </small></cite>, from an engraving originally created in circa 1770