<a href="https://en.wikipedia.org/wiki/Charles_Martin_Hall" id="mwgQ" rel="mw:WikiLink" title="Charles Martin Hall">Charles Martin Hall</a> produced the first samples of <a href="https://en.wikipedia.org/wiki/Aluminium" id="mwgg" rel="mw:WikiLink" title="Aluminium">aluminium</a> from the electrolysis of aluminium oxide, after several years of intensive work. He was assisted in this project by his older sister, <a href="https://en.wikipedia.org/wiki/Julia_Brainerd_Hall" id="mwgw" rel="mw:WikiLink" title="Julia Brainerd Hall">Julia Brainerd Hall</a>.<sup about="#mwt55" class="mw-ref reference" data-mw='{"name":"ref","attrs":{},"body":{"id":"mw-reference-text-cite_note-9"}}' id="cite_ref-9" rel="dc:references" typeof="mw:Extension/ref"><a href="./February_23#cite_note-9" id="mwhA" style="counter-reset: mw-Ref 9;"><span class="mw-reflink-text" id="mwhQ">[9]</span></a></sup>
<span class="mw-reference-text" id="mw-reference-text-cite_note-9"><cite about="#mwt52" class="citation journal cs1" id="CITEREFLaparra2012">Laparra, Maurice (2012). <a class="external text" href="https://www.cairn.info/revue-cahiers-d-histoire-de-l-aluminium-2012-1-page-84.htm" id="mwBmo" rel="mw:ExtLink nofollow">"The Aluminium False Twins. Charles Martin Hall and Paul Héroult's First Experiments and Technological Options"</a>. <i id="mwBms">Cahiers d'Histoire de l'Aluminium</i>: 84–105. <a class="mw-redirect" href="./Doi_(identifier)" id="mwBmw" rel="mw:WikiLink" title="Doi (identifier)">doi</a>:<a class="external text" href="https://doi.org/10.3917%2Fcha.048.0084" id="mwBm0" rel="mw:ExtLink nofollow">10.3917/cha.048.0084</a>. <a class="external text" href="https://web.archive.org/web/20190224001741/https://www.cairn.info/revue-cahiers-d-histoire-de-l-aluminium-2012-1-page-84.htm" id="mwBm4" rel="mw:ExtLink nofollow">Archived</a> from the original on 2019-02-24<span class="reference-accessdate" id="mwBm8">. Retrieved <span class="nowrap" id="mwBnA">2019-02-23</span></span>.</cite><span about="#mwt52" class="Z3988" id="mwBnE" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&amp;rft.genre=article&amp;rft.jtitle=Cahiers+d%27Histoire+de+l%27Aluminium&amp;rft.atitle=The+Aluminium+False+Twins.+Charles+Martin+Hall+and+Paul+H%C3%A9roult%27s+First+Experiments+and+Technological+Options&amp;rft.pages=84-105&amp;rft.date=2012&amp;rft_id=info%3Adoi%2F10.3917%2Fcha.048.0084&amp;rft.aulast=Laparra&amp;rft.aufirst=Maurice&amp;rft_id=https%3A%2F%2Fwww.cairn.info%2Frevue-cahiers-d-histoire-de-l-aluminium-2012-1-page-84.htm&amp;rfr_id=info%3Asid%2Fen.wikipedia.org%3AFebruary+23"></span></span>