For which invention are both Christian Friedrich Schönbein, a the German-Swiss chemist and William Robert Grove, the Welsh judge and physical scientist given credit?
Christian Friedrich Schönbein Christian Friedrich Schönbein (18 October 1799 – 29 August 1868) was a German-Swiss chemist who is best known for inventing the fuel cell (1838) at the same time as William Robert Grove, Robert Cumming and his discoveries of guncotton and ozone.
William Peter Durtnall William Peter Durtnall (1873–1947), M.I.Mar.E., M.I.Auto.E., M.I.Loco.E, was a British electrical engineer and inventor, and a captain in the Royal Air Force. He was involved in both marine and locomotive engineering and invented a thermo-electric engine patented as the "Paragon". Durtnall transferred from the Royal Navy Volunteer Reserve to a temporary commission as a captain in the Royal Air Force in April 1918.