Jonathan Nash Hearder
... that blind electrical engineer Jonathan Nash Hearder, when called to advise upon the Atlantic Cable in 1858, tested it by inserting his tongue into the 2000-mile-long circuit?
... that blind electrical engineer <b id="mwD_Y"><a href="./Jonathan_Nash_Hearder" id="mwD_c" rel="mw:WikiLink" title="Jonathan Nash Hearder">Jonathan Nash Hearder</a></b>, when called to advise upon the <a href="./Transatlantic_telegraph_cable" id="mwD_g" rel="mw:WikiLink" title="Transatlantic telegraph cable">Atlantic Cable</a> in 1858, tested it by inserting his tongue into the 2000-mile-long circuit?