The first commercial use of an <a href="https://en.wikipedia.org/wiki/Electrical_telegraph" id="mw2w" rel="mw:WikiLink" title="Electrical telegraph">electrical telegraph</a> is successfully demonstrated in London by <a href="https://en.wikipedia.org/wiki/William_Fothergill_Cooke" id="mw3A" rel="mw:WikiLink" title="William Fothergill Cooke">William Cooke</a> and <a href="https://en.wikipedia.org/wiki/Charles_Wheatstone" id="mw3Q" rel="mw:WikiLink" title="Charles Wheatstone">Charles Wheatstone</a>.