INDEX
479
Defect,_ mass, 232
,
Discharge:
_'
De__ectmn
of:
-
.
_
are, 177
,
——_,alpha rays 262, (240) 464
——
clean-up phenomena, 363
.
—
beta rays, 274, 36, (240)
'
——
corona, 445
"
'
——
cathode rays, 20—48, 466
«
—
Geissler, 172, 165
—
electrons, 20—48, 466
—
glow, 172
,
——
protons,
465
-——
probes, 166
De _Forest,
118
——
exber., 185
,
,
De-1omzauon time, 165
-—
starting conditions, 164
Delon, 297
'
,
—
stoÿping time, 165
Delta rays, 439
,
——
through gases,
164—179,
'
Dempster:
——
exper.,
181
——
mass spectrograph, 230, 227
—
tube, study of, 181
‘
Density of electrons:
,
Disintegration:
.
'
—_
in a discharge, 172
—
articial, 320
,
Deposits, active, 247
——
by cosmic rays, 351
'
Dershem, 216, 218, 412
-
_
_
-—
constant, 244, 321 -
-
-
,
-—
electrometer, 406
-
——
electrons, 276
.
'
Detection of particles, 418—441
——
spontaneous,
240—259
_
"
..
Deuterium:
..
-—table, 471
'
——
discovery,.232
-—
theory, 244, 249
,
—
preparation, 236, 378
'
_
——
voltage, 179
,,
,
_
-
,—
Deuteron:
Displacement laws, 252 …
.
_
‘
_
—charge, 232
_
.
Dist6rtion of drop-tracks,
437
,
'
-—
discovery,
232
_
Distribution:
‘
,
-
_
_
-—
mass, 232
'
——'Fermi-_Ditac, 105
,
_
-—
transmutations by, 327
-—-_
of beta ray energies, 276
Dewar ash, 357 '
_
—
_
;
-—-of electrons in atoms, 213
_
.
Dielectrics, 446
_
'
.
——
of slow neutron velocities,333
,
Differential:
,
,
,
,
‘
—Maxwelàn, 105
.
,
Ÿ
,
…
f
—
—
chambers', 420
,
,
Doan:
,
…
,É',’
7
*
…
.
—
——
range curve, 264:
,'
L.
“" measurement °fi
v
,.
'
Di'raction:
‘ .
,
' _
,
_
,
'
--——
electron
(205)
_
.
——
of_electrons, 55,56
_
,
37
-
,
Ï
______ e‘i{_peh, 63
_
,
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