492
_,
»
INDEX
Planck:
.
Potential (Conf.) '
'
——
black body radiation, 78
——
distribution between (Conf.)
—
constant;
—
plane electrodes, 115
——
exper.,
95
-—-—
excitation, 148
'
'
——
measurement of, 81, 90
'
-———exper.,
154
Plasma, 176
.
,
,
'
—extinction, 165
Plate:
‘
-
-
,
——
gradient:
-—
cu”rrent vs. temperature,
107
-——-—
between cylinders, 448
'
—
current vs. voltage, 106, 122
——
between planes, 115
——
for triode, 118
,'
_
——
disruptive, air, 446
‘
—
resistance, 121
,
——
in a diode, 115
Plateau, of counter tubes, 432
-—
insulators, 447
‘
,
Pohl and Walter, 205
—high;
Point count€f,424
—
'
-_—— corona, 445
_
_
Polarization selectivity, 72 —
—
—
insulators, 446
5
.
Polarizêd X-rays, 204
=
‘
measurementof, 442
Pool, COrk 'and Thornton, 332
—
production of, 296—203
’
'
,
“PO—96,312
«
—
————'——'f0rx-rays, 65,193, 195
_
,
Positive:
…
——
in a discharge tube;
*
*
\““ column, 175
,
,
Ï ,
——exper.,
185
!
‘
*
-
—gradient, 173, 174,176
'
‘.
167, 177
'
«
;î
-
__
SPaCÇ, 169, 172
'.
,
‘,
*
'——‘— sources, 305, 228, 230, 237 " '
——iohizing, 145
*
'
‘
‘
,
——exper, 237
,
_
.
,'
2
_
-
,
_
table, 460
'v:f:,
-——parabohs,224
—
loW,çsbürcé, 15
…
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