Johann Jakob Balmer

Johann Jakob Balmer was born on 1 May 1825 in Switzerland, trained as a mathematician rather than a physicist. In middle age he turned his attention to the spectrum of hydrogen, hunting for a pattern in the wavelengths of its visible light. The formula he produced — the Balmer series — predicted those wavelengths with uncanny accuracy, revealing an order no one had yet explained. He published it without understanding the atomic mechanics beneath, years before quantum theory arrived to show what he'd found. Balmer died on 12 March 1898, his equation outliving him as a cornerstone of spectroscop…