amateur chemist
... that Charles Martin Hall , working as an amateur chemist in a shed, developed what became the Hall-Héroult process for extracting aluminium?
... that <a href="./Charles_Martin_Hall" id="mwBA4" rel="mw:WikiLink" title="Charles Martin Hall">Charles Martin Hall</a> <i id="mwBA8">(pictured)</i>, working as an <b id="mwBBA"><a href="./Amateur_chemistry" id="mwBBE" rel="mw:WikiLink" title="Amateur chemistry">amateur chemist</a></b> in a shed, developed what became the <a class="mw-redirect" href="./Hall-Héroult_process" id="mwBBI" rel="mw:WikiLink" title="Hall-Héroult process">Hall-Héroult process</a> for extracting <a href="./Aluminium" id="mwBBM" rel="mw:WikiLink" title="Aluminium">aluminium</a>?