TY - JOUR T1 - On the Vapour-Density of Potassium.--Preliminary Notice JF - Proceedings of the Royal Society of London (1854-1905) VL - 21 SP - 202 EP - 204 PY - 1872/01/01/ UR - http://dx.doi.org/10.1098/rspl.1872.0042 M3 - doi:10.1098/rspl.1872.0042 AU - Dewar, J. AU - Dittmar, W. ER -