source of energy of radiation, 442 et seq. theory of radio-active change, 444 et seq. table of active products, 449 rate of change of, 458 life of, 458 radium probable product of, 459 et seq. amount of radium in, 460 et seq. amount of, in radio-active minerals, 461 growth of radium in, 463 conservation of radio-activity of, 469 total emission of energy from 1 gram of, 475 possible causes of disintegration of, 486 et seq.
Uranium X
separation of, by Crookes, 219
separation of, by Becquerel, 219
decay of activity of, 223
recovery of activity of, 223
theory to explain production of, 224 et seq. material nature of, 226 explanation of decay of activity of, 229 changes in, 346 et seq. radiations from, 347 et seq. method of measurement of radiations from, 347 effect of crystallization on activity of, 349 diffusion of, 350 Velocity of ions in electric field, 42 et seq. difference between, of positive and negative ions, 43 et seq. of β particle or electron, 126 et seq. variation of mass of electron with, 127 of α particle, 148 of transmission of carriers of excited activity, 320 et seq. of ions in atmosphere, 528 Villard discovery of γ rays from radium, 179 alteration of X ray screen with time, 205 activity produced by cathode rays, 530 Vincenti and Levi Da Zara radium emanation in spring waters, 516 Voller variation of activity of radium with concentration, 467 Volume of radium emanation, calculation of, 289 decrease of, of radium emanation, 290 Walker, G. W. theory of electrometer, 90 Walkhoff action of radium rays on skin, 216 Wallstabe diffusion of radium emanation into liquids, 276 Water emanation from, 510 et seq. decay of activity of emanation from, 511 et seq.
Water-falls
amount of excited activity produced at Niagara, 520
electrification produced near, 520
Watts, Marshall
atomic weight of radium, 18
Weichert
velocity of cathode rays, 76
Weight
loss of by radio-elements, 473
attempts to measure loss of in radium, 474
Wheeler and Bumstead
diffusion of radium emanation, 273
emanation from surface water and the soil, 512, 522
identity of emanation from soil with radium emanation, 512, 522
Whetham
effect of valency of ion on colloidal solutions, 215
production of radium from uranium, 463
Wiedemann
thermo-luminescence, 207
Wiedemann and Schmidt
thermo-luminescence, 207
Wien
value of e/m for canal rays, 78
positive charge of canal rays, 78
amount of charge carried by β rays, 124
Willcock, Miss and Hardy
coloration of iodoform solution by radium rays, 214
Willemite
phosphorescence of, under radium rays, 203
use of, to show condensation of emanation, 279
Willows and Peck
action of radium rays on spark, 208
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