TABLES
461
TABLE 3.—SPARKING POTENTIALS
_The yoltages given are
the usual root—mean—5quare voltagœ)
Wh1Ch v:1ll Just break down non-1omzed ai1'
at a pressure of 760 mm. and temperæ '
ture 25
C.
_
N eedle gap voltages at a relat1ve humidity of 80%. Sphere gap values
pr aCË1C3HY _1ndependent
of hum1d1ty. Adapted from values in the HandbuCh der
—
and Scheel), Vol. 16, p. 407, 1927. 1 and 2 cm. sphere values from
Kaye X-rays,” p. 102, 1923.
K1lovolts. A = Electrodes ungrounded. B = One electrode grounded
—'——‘———'—_———————_—_
«
Diameter of 8 heres
653» N...... ______1______
cm
Points
1 cm. 2 cm.
6.25 cm.
12.5 cm.
25.0 cm.
50.0 cm.
'
A
——
-—
————.
__r_____ — __
A
A
A
B
A
B
A
B
A
B
0.25
3
10
10
9
9
9
9
0.50
5
17
17
17
17
17
17
\
.
1.00
12
27
31
33
33
33
33
'
1.50
17
32
40
45
45
45
45
_
2.0
23
36
48
59
59
59
59
60
60
60
'
60
,
3.0
33
42
58
82
79
85
85
86
86
86
86
_
4.0
42
45
65
100
93
109
109
91
91
93
93
5.0
49
47
71
114
103
,.131
130
139
139
140 '
136
6.0
56
77
127
111
151
147
163
160
164
163
_
7.0
61
169
159
184
182
188
8.0
66
‘
185
171
206
203
218
214
9.0
71
-
_
_
200
181
226
2224
243 238
10.0
75
\
214
240 269“ 264
'
12.0
'
237
208
278'
272
313
312
-
15.0
'
”
226
325
3,11"
381- 371
17.5
'
-
-
7
'
1
'
362
_
20.0
‘
,
'
’ÏJÏ"* 3925
475451
22.5
-
.
25.0
:
ÏÎZLÏ‘J.«ILv—440ÿ5395Î 555
.
Below—Average
.
Éï
…
SPheré grounded- D .V…alües f°f°ä“V°SPheœgmnded
-
.
‘
'
From Meaâor. E. E. 53 942
;
"
5«_
Rose, Rèv. Sci. Inst .6,63“(1935):_{9‘:'1:‘,{î
-
‘»
(Peak)
SD
'
137263 3824955976857578181872920|960
995
*“
.
,
:
461
TABLE 3.—SPARKING POTENTIALS
_The yoltages given are
the usual root—mean—5quare voltagœ)
Wh1Ch v:1ll Just break down non-1omzed ai1'
at a pressure of 760 mm. and temperæ '
ture 25
C.
_
N eedle gap voltages at a relat1ve humidity of 80%. Sphere gap values
pr aCË1C3HY _1ndependent
of hum1d1ty. Adapted from values in the HandbuCh der
—
and Scheel), Vol. 16, p. 407, 1927. 1 and 2 cm. sphere values from
Kaye X-rays,” p. 102, 1923.
K1lovolts. A = Electrodes ungrounded. B = One electrode grounded
—'——‘———'—_———————_—_
«
Diameter of 8 heres
653» N...... ______1______
cm
Points
1 cm. 2 cm.
6.25 cm.
12.5 cm.
25.0 cm.
50.0 cm.
'
A
——
-—
————.
__r_____ — __
A
A
A
B
A
B
A
B
A
B
0.25
3
10
10
9
9
9
9
0.50
5
17
17
17
17
17
17
\
.
1.00
12
27
31
33
33
33
33
'
1.50
17
32
40
45
45
45
45
_
2.0
23
36
48
59
59
59
59
60
60
60
'
60
,
3.0
33
42
58
82
79
85
85
86
86
86
86
_
4.0
42
45
65
100
93
109
109
91
91
93
93
5.0
49
47
71
114
103
,.131
130
139
139
140 '
136
6.0
56
77
127
111
151
147
163
160
164
163
_
7.0
61
169
159
184
182
188
8.0
66
‘
185
171
206
203
218
214
9.0
71
-
_
_
200
181
226
2224
243 238
10.0
75
\
214
240 269“ 264
'
12.0
'
237
208
278'
272
313
312
-
15.0
'
”
226
325
3,11"
381- 371
17.5
'
-
-
7
'
1
'
362
_
20.0
‘
,
'
’ÏJÏ"* 3925
475451
22.5
-
.
25.0
:
ÏÎZLÏ‘J.«ILv—440ÿ5395Î 555
.
Below—Average
.
Éï
…
SPheré grounded- D .V…alües f°f°ä“V°SPheœgmnded
-
.
‘
'
From Meaâor. E. E. 53 942
;
"
5«_
Rose, Rèv. Sci. Inst .6,63“(1935):_{9‘:'1:‘,{î
-
‘»
(Peak)
SD
'
137263 3824955976857578181872920|960
995
*“
.
,
: