TY - JOUR T1 - On the Refractive Indices of Mercury and Thallium Vapours JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 100 IS - 703 SP - 191 EP - 200 PY - 1921/11/01/ UR - http://dx.doi.org/10.1098/rspa.1921.0080 M3 - doi:10.1098/rspa.1921.0080 AU - McLennan, J. ER -