INDEX
_
497
Source (Cent.)
'
Spontaneous disintegration, 240—259
—
of gamma rays, 290
Sputtering:
.
Space charge:
——
cathode, 381
-—-—
control of;
—
quartz bers, exper., 385
——
by grid, 117
Stability:
—
by plate, 116
——
of nuclei, 234, (308)
——
by positive ions, 146
’
——
of radioactive substances, 267
—
in shot effect, 102
Stabilization of voltage, 421
—
in two—electrode tubes, 115 ‘
Stable equilibrium, 243, 247, 250
—
tetrode, 124
Standard:
"
_
Space lattice, 53
—
condenser, 394
Space potential, 169, 172
—
radioactive, 241
'
_'
-
Spark:
——
x—ray intensity, 198
'
—
gap, 442
Starting potential:
'
.
—
potential, 461
—
see striking potential.
’
*
,
——
table, 461
’
Starting time:
—
vacuum (hot), 177
——
of discharge tube, 165
.
—
Specic ionization:
Statistical uctuations, 250
'
-
'
-
—
of alpha particles, 273
Stokes’:
—
of beta particles, 282
——
uorescent law, 203
’
—
of electrons, table, 468
—
law of fall, 5
-
Spectral distribution:
Stoney, C. J., 1
-
_
—
photoelectric, 71
Stop—COCkS;
'
'
'
——
exper.,
93
—grease,
'
'
'
.
Spectrometer, spectrograph:
-—mercury, 375
'
*
’
——
beta ray, 275
__
—test for leaks,
372
’
_—
‘
—
—Bragg, 205; exper.,
218
Stopping potential,
"
‘
_
—
cosmic ray, 349
_
Stoppîng power=
269
_‘
_,
‘
“
’
——
curved crystal, 210
_
—exper.,
287“ ‘
_
"
"
_' Ÿ
_
;
_
—‘—
double crystal, 210
——
for alpha PafÜClesî
'
_
‘
_
earth’s eld, 349
_
'
table,
463
,
_
mass, 226—231
Stopping't1mez'
_
——
oscillating crystal, 210
'
'
_
of discharge
tube,165
'
_
__
positive ray, 226—231
Stragghng:
Ï»=….
_
…
—
powdered crystal, 58,210
_— 0f alpha PafÜCÏeS:265
—
—
x-ray, 205; exper.,
218
“
"
Sti—lamens,l76
‘
.
:
'_ -
Spectroscopic:
'
‘
ï
‘
Str1kingpotenüal
‘
;
e/m measurement, 35ïî“î*fî
mgasmledt°de s’178
SpeCtrum=
“”exPer188
-— mass, 227
.
…
”
.:
smngelew°meters’407 ‘Ï- Î . ».
.
‘ ?
—
of alpha raYS, 262 :'—-'ï
Ê“‘PÊ°dmm“77
‘
*
'
'
,
Speed of pumps‘, 354
; x
'
-
‘
”— table,461
‘
‘
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'
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