TY - JOUR T1 - On the Spectra of Sodium and Potassium JF - Proceedings of the Royal Society of London (1854-1905) VL - 29 SP - 398 EP - 402 PY - 1879/01/01/ UR - http://dx.doi.org/10.1098/rspl.1879.0067 M3 - doi:10.1098/rspl.1879.0067 AU - Liveing, G. AU - Dewar, J. ER -