John Martyn Roberts

Martyn John Roberts FRSE DL (1806–1878) was a 19th-century Welsh scientist and inventor who performed experiments with his unique galvanic battery for controlled explosion and contributed to innovations in conductors, photography theory, voltometry, electric light and much more.
Life.
He was born in Wales on 2 August 1806 the son of Caroline Yalden of Lovington and her husband, John Roberts. He studied science at the University of Edinburgh.
In 1840 he was elected a Fellow of the Royal Society of Edinburgh. His proposer was Sir John Robison.
In 1864 he patented an invention to spin wool. He also in the same year patented a device to reduce friction on ships propellers but this lapsed in 1867 due to non-payment of the £50 stamp duty.
He died on 8 September 1878. He is buried in Llangenny Churchyard with his son in a majestic ornately decorated obolesk
He was a deeply caring man who's innovations characterise a most humanitarian inventor of science but who sadly, lies unknown, forgotten and uncelebrated in "The Land of his Mothers & Fathers"
There will be, shortly a pioneering mini-biography to this forgotten Cymro on YouTube ; "How The Welsh assisted The World" 
Family.
In 1840 he married Anne Eliza Gordon daughter of William Gordon, brother of Sir John Gordon. They lived at Pendarren House near Crickhowell in Wales.
Their eldest son was William Scarlett Roberts (b.1849).