His inventions include the moving coil oscillograph , as well as the thermo - ammeter and thermo - galvanometer .
William Du Bois Duddell ( 1 July 1872 , Kensington , London -- 4 November 1917 , Wandsworth , London ) was an English physicist and electrical engineer .
William Du Bois Duddell 's inventions include the moving coil oscillograph , as well as the thermo - ammeter and thermo - galvanometer .
William Du Bois Duddell ( 1 July 1872 , Kensington , London -- 4 November 1917 , Wandsworth , London ) was an English physicist and electrical engineer .