Muppets characters Bunsen Honeydew and Beaker, among others. It is most commonly used for Bunsen burners and oxyacetylene welding torches. Bunsen serves as a foil for Beaker. Other puppets of this type include Cookie Monster, Fozzie Bear, Beaker, and Bunsen Honeydew. The latter attraction is a free-roving vehicle with audio-animatronics of Bunsen Honeydew and Beaker. Bunsen and Beaker only appeared as background characters in the wedding scene. Both Mendeleev and Meyer worked with Robert Bunsen. In 1859, chemist Robert Bunsen and physicist Gustav Kirchhoff expanded on Fraunhofer's invention. His first name is derived from Robert Bunsen, after whom the Bunsen Burner was named. The solubility of gases is sometimes also quantified using Bunsen solubility coefficient. Robert Bunsen discovered chromium's resistance to strong acids. Tyndall studied under Bunsen for two years. Measurements of professor Bunsen in this year showed that Geysir was erupting high. From this work, the reciprocity law of Bunsen and Roscoe originated. He also kept two conductors linked to the same Bunsen batteries.