Robert Bunsen, German chemist, c 1850s.
© Science Museum / Science & Society Picture Library
Signed engraving made by C Cook, after a photograph. Bunsen (1811-1899) is widely considered one of the greatest experimental chemists of the 19th century. He was a pioneer of chemical spectroscopy, and the inventor of the Bunsen cell, the Bunsen ice calorimeter and the Bunsen burner. Spectroscopy is the branch of science concerned with the investigation and measurement of spectra produced when matter interacts with or emits electromagnetic radiation. Bunsen discovered the the chemical elements, caesium and rubidium.