76 
MR. S. BUTTERWORTH ON EDDY-CURRENT LOSSES 
Table III. — Spacing = 6-4 cm. 
6° C. 
18-5 
18-9 
19-3 
20-4 
20-7 
20-9 
21-0 
21-0 
21-6 
/ . 
Calculated 
60 
266 
582 
923 
1465 
2019 
1992 
3028 
3960 
5320 
Rs/R 
1-0048 
1-088 
1-340 
1-602 
1-984 
2-280 
2-268 
2-728 
3-075 
3-470 
R r ,/R 
0-0003 
0-0045 
0-0099 
0-0132 
0-017 
0-021 
0-020 
0-026 
0-031 
0-036 
R'/R 
1-0051 
1-093 
1-350 
1-615 
2-001 
2-301 
2-288 
2-754 
3-106 
3-506 
Observed R'/R 
Difference per 
1-0087 
1-100 
1-354 
1-640 
2-037 
2-344 
2-322 
2-851 
3-145 
3-558 
cent. ... 
—0-4 
-0-6 
-0-3 
— 1-6 
-1-8 
-1-9 
-1-5 
-3-6 
-1-2 
-1-5 
This group is abnormal on the resistance-temperature diagram. If we assume IT 
and R as measured are both too small by a constant amount = 0-04 R, the group 
becomes normal on the resistance-temperature diagram and gives the following values 
replacing the observed R'/R :— 
Corrd. Obsd. 
R'/R 
1-008 
1-096 
1-343 
1-617 
2-000 
2-296 
2-275 
2-784 
3-062 
3-466 
Difference per 
cent. 
-0-3 
-0-3 
+0-5 
-0-2 
+0-0 
+0-2 
+0-6 
-1-1 
+1-5 
+1-5 
Table IV.—Spacing = 0*8 cm. 
6° C. ... 
16-3 
16-5 
16-9 
17-2 
17-8 
18-0 
18-3 
18-4 
/. 
Calculated 
60 
239 
671 
1068 
1509 
1991 
1988 
2486 
3028 
3880 
4900 
R s /R ... 
1-0050 
1-073 
1-424 
1-732 
2-028 
2-283 
2-280 
2-517 
2-744 
3-067 
3-409 
Rp/R ... 
0-0052 
0-061 
0-187 
0-254 
0-314 
0-382 
0-380 
0-424 
0-477 
0-550 
0-620 
R'/R ... 
Observed 
1-0102 
1-134 
1-611 
1-986 
2-342 
2-665 
2-660 
2-941 
3-221 
3-617 
4-029 
R'/R ... 
Difference 
1-0124 
1-132 
1-604 
1-981 
2-330 
2-643 
2-638 
2-912 
3-179 
3-587 
3-955 
per cent. 
-0-2 
+0-2 
+0-4 
+0-3 
+0-5 
+0-8 
+0-8 
+1-0 
+1-3 
+0-8 
+1-8 
The calculated values are in general too high. A spacing 0-85 cm. would give the 
following calculated values and differences:— 
R'/R ... 
1-0100 
1-131 
1-602 
1-973 
2-326 
2-646 
2-641 
2-920 
3-197 
3-589 
3-998 
Difference 
per cent. 
-0-3 
-0-1 
-0-1 
-0-4 
-0-2 
+0-1 
+0-1 
+0-3 
+0-6 
+0-1 
+0-4 
