Page:Radio-activity.djvu/592

  velocity acquired by, between collisions, 58
  energy required to produce, 58, 551
  comparative number of, produced in gases, 65
  disturbance of potential gradient by movement of, 65
  production of, in insulators, 209
  number of, produced by α particle, 433
  number produced per c.c. in closed vessels, 533 et seq.


Joly
  motion of radium in an electric field, 211
  absorption of radium rays by atmosphere, 492 (see foot-note)


Kaufmann
  velocity of cathode rays, 75
  variation of e/m with velocity of electron, 127 et seq.

Kelvin
  theory of radio-activity, 441
  age of sun and earth, 492, 493

Kelvin, Smolan and Beattie
  discharging power of uranium rays, 7

Kleeman and Bragg
  theory of absorption of α rays, 172 et seq. relation between ionization and absorption, 174 et seq. range of α rays in air, 174 four sets of α rays from radium, 174 et seq.

Kohlrausch
  conductivity of water altered by radium rays, 208

Kohlrausch and Henning
  conductivity of solutions of radium bromide, 208

Kunz
  phosphorescence of willemite and kunzite, 203

Kunz and Baskerville
  phosphorescence of substance under radium rays, 204

Kunzite
  phosphorescence of, under radium rays, 203


Laborde and Curie
  heat emission of radium, 419
  origin of heat from radium, 440
  radium emanation in waters of hot springs, 514

Langevin
  coefficient of recombination of ions, 41
  velocity of ions, 45 et seq.
  energy required to produce an ion, 58
  secondary radiation produced by X rays, 187
  slow moving ions in air, 528

Larmor
  radiation theory, 77
  radiation of energy from moving electron, 79
  structure of the atom, 157

Lead, radio-active
  preparation of, 26
  radiations from, 26

Le Bon
  rays from bodies exposed to sunlight, 5
  discharging power of quinine sulphate, 9, 530

Lenard
  ionization of gases by ultra-violet light, 9
  action of ions on a steam jet, 47
  penetrating power of cathode rays, 73
  negative charge carried by Lenard rays, 120
  absorption of cathode rays proportional to density, 136, 137

Lerch, von
  chemical properties of active deposit of thorium, 313
  electrolysis of solution of active deposit, 313
  effect of temperature on excited activity, 315
  temporary activity of active deposit from thorium, 415

Lockyer
  inorganic evolution, 499

Lodge, Sir Oliver
  electronic theory, 69
  instability of atoms, 487

Lorentz
  structure of atoms, 157

Lowry and Armstrong
  radio-activity and phosphorescence, 444

Luminosity
  of radium compounds, 205
  change of, in radium compounds with time, 205
  spectrum of phosphorescent light from radium bromide, 206
  of radium compounds unaffected by temperature, 210


Mache
  radium emanation in hot springs, 513

Mache and von Schweidler
  velocity of ions in air, 528