TY - JOUR T1 - Determination of the Coefficient of Inter-Diffusion of Gases and the Velocity of Ions under an Electric Force, in Terms of Mean Free Paths JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 86 IS - 586 SP - 197 EP - 206 PY - 1912/02/28/ UR - http://dx.doi.org/10.1098/rspa.1912.0013 M3 - doi:10.1098/rspa.1912.0013 AU - Townsend, J. ER -