TY - JOUR T1 - The Variation of Ionisation with Velocity for the $ \beta $-Particles JF - Proceedings of the Royal Society of London. Series A, Containing Papers of a Mathematical and Physical Character (1905-1934) VL - 85 IS - 578 SP - 240 EP - 248 PY - 1911/06/09/ UR - http://dx.doi.org/10.1098/rspa.1911.0035 M3 - doi:10.1098/rspa.1911.0035 AU - Wilson, W. ER -