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absorption actinium æther amplitude angle approximately atomic number bands benzene Bohr's calculated cathode circuit coefficient collision constant corresponding crystal curve dark space deflexion diameter dielectric constant displacement distance effect electric electron electroscope elements energy equation experimental experiments formula frequency gases given gives greater heat Helmholtz resonator hydrogen integral intensity ionization ionizing potential isotopes J. J. Thomson light lines Lord Rayleigh magnetic mass-number maxima maximum measurements mercury metal method minima mobility molecular molecules motion nitrogen observed obtained odd isotopes orbit oscillations paper particles Phil Phys plane plate positive ions possible potential pressure Proc quantum defect quantum number radiation radium radon ratio rays reflexion resonator rotation selenium shown solution spectra spectrum sub-groups surface tension Table temperature theory tube vapour velocity vibration volts wave wave-length wire X-rays