In 1863 the spectroscope, which can separate the unique band of colors that each element gives off, was used to identify indium, which was the 63rd element discovered.
Aastal 1863 määratleti spektroskoobi abil, mis suudab eristada igalt keemiliselt elemendilt kiirgavat ainuomast värvusspektrit, 63. keemilise elemendina indium.