TY - JOUR T1 - An Investigation of the Ionising Power of the Positive Ions from a Glowing Tantalum Filament in Helium JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 95 IS - 670 SP - 333 EP - 353 PY - 1919/03/15/ UR - http://dx.doi.org/10.1098/rspa.1919.0013 M3 - doi:10.1098/rspa.1919.0013 AU - Horton, F. AU - Davies, A. ER -