102 
MR. F. E. SMITH ON THE ABSOLUTE MEASUREMENTS OF A 
Table XXL—Results of Measurements of O'Ol ohm at 20°'0 C. 
Part A (rings away). 
Part B (rings near). 
Measured 
Difference from 
Measured 
Difference from 
Date. 
value of R in 
mean. Parts 
Date. 
value of R in 
mean. Parts 
cm./sec. 
in 100 , 000 . 
cm./sec. 
in 100 , 000 . 
13.2.13 
100092 20 
+ 1'8 
18.6.13 
100093 20 
+ 3-5 
4.3.13 
9 O 40 
± 0'0 
19.6.13 
87go 
-1-9 
28.3.13 
8830 
- 2'1 
19.6.13 
9 O 90 
+ 1-2 
29.3.13 
90jo 
+ 0'1 
19.6.13 
9150 
+ 1'8 
31.3.13 
93 20 
+ 2'8 
20.6.13 
89 2 o 
-0'5 
31.3.13 
88 (jo 
- 1-8 
20.6.13 
8880 
-0'9 
31.3.13 
93 40 
+ 3'0 
21.6.13 
91ao 
+ 1-8 
1.4.13 
93 0 o 
+ 2'6 
24.6.13 
90 2 o 
+ 0-5 
1.4.13 
91 90 
+ 1-5 
25.6.13 
8670 
-3'0 
3.4.13 
8850 
- 1-9 
26.6.13 
8750 
- 2'4 
4.4.13 
87go 
- 2 • 6 
26.6.13 
90 2 o 
+ 0'5 
5.4.13 
87 5 o 
-2'9 
27.6.13 
89 2 o 
-0'5 
Mean . . . 
IOOO 9 O 40 
±1-9 
Mean . . . 
100089 70 
±1'5 
T> * i 100090 4 Q "t 10008970 -t AAAAA I . f>A° A At 
.'. Resistance = -—-- = 100090io cm./sec. at 20 0 0. 
2 
Probable error of observations = 5 parts in 1,000,000. 
Resistance in international ohms (N.P.L.) = 0'0100 0 383 at 20°'0 C. 
Difference :—Absolute measure - international measure x 10 9 = 51'8 parts in 100,000. 
Table XXII.—-Results of Measurements at 20°'0 C. of an Effective Resistance 
of 0'002 ohm. 
Part A (rings away). 
Part B (rings near). 
R in 
Difference. 
Differ- 
R in 
Difference. 
Differ- 
Date. 
R in 
inter- 
Abs. - int.(10 9 ) 
ence 
Date. 
R in 
inter- 
Abs. - int.(10 9 ) 
ence 
cm./sec. 
national 
parts in 
from 
cm./sec. 
national 
parts in 
from 
ohms. 
100,000. 
mean. 
ohms. 
100,000. 
mean. 
6.3.13 
200479 7 
200368 2 
55'8 
+ 1-8 
28.1.13 
200469 0 
200365 0 
52'0 
+ 0'0 
6.3.13 
472 3 
368o 
52-1 
- 1-9 
28.1.13 
199457a 
199354 0 
52-0 
+ 0-0 
6.3.13 
472 4 
36S 2 
52'1 
-1-9 
4.2.13 
200465 4 
200365o 
50'2 
- 1'8 
7.3.13 
478 6 
368. 
55-2 
+ 1-2 
5.2.13 
468(5 
365 0 
51'8 
-0'2 
7.3.13 
478j 
368 2 
55'0 
+ 1-0 
6.2.13 
4/37 
365 0 
54'3 
+ 2'3 
Mean . . 
54'0 
±1-6 
Mean. . 
52-0 
±0'9 
Probable error of observations = 6 parts in a million. 
Difference :—Absolute measure - International measure x 10 9 = (54'0-f 52'0)/2 = 53'0 parts in 100,000. 
