Carl Auer von Welsbach

Auer von Welsbach is known for his isolation of new chemical elements, his work with rare earths, and his production of radically-improved gas-mantles, lighter-flints and light-bulbs. He did his doctoral research under Bunsen and Kirchhoff at Heidelberg; following Bunsen’s death, he acquired his library. Aston and Rutherford were among his correspondents; he sent Rutherford radioactive isotopes to experiment with.