The London, Edinburgh and Dublin Philosophical Magazine and Journal of Science

according activity appears applied approximately arrangement assumed atoms bismuth calculated carbon caused cent centres charge chemical collision compared consider considerable constant containing corresponding curve determined diameter direction discharge displacement distance effect electric electrons elements emission energy equal equation experiments expression fact field force frequency function gases given gives glow greater heat helium hydrogen ignition increase indicate intensity ionization ions less light lines lower mean measured mercury metal method mixture molecular molecules nature normal observed obtained occur pass Phil plane plate positive possible potential present pressure probable produced proportional quantities radiation ratio rays relation relative represented resistance respectively shown solution space spark spectrum structure surface Table taken temperature theory tube vapour velocity volts wires