256 
MESSRS. R. T. GLAZEBROOK AND E. B. SARGANT ON THE 
Taking each series separately, the values we obtain are 
Series A '98673. 
„ B -98598. 
„ C '98716. 
The greatest difference is "00118, or about '12 per cent. 
Again, if we refer to the Table IV., we cannot find any clear indication of an error 
depending on the length of the rods used to separate the coils. The values of B 0 in 
series B are, it is true, somewhat small ; there are, however, two values in senes A 
and one in series C which are smaller than one of those in series B. 
Neither do we find any connexions between the differences and the electromotive 
force used. Arranging the values in order of electromotive force, we have 
2 
Daniell’s . . 
. . 158-564 . . 
. . 1 experiment. 
4 
33 
. . 158-352 . . 
Mean of 2. 
5 
Thomson’s . . 
. . 158-209 . . 
„ 4. 
6 
33 
. . 158-488 . . 
„ 2. 
We must notice, however, that only one experiment was made with the smallest 
electromotive force. 
It will be instructive to arrange the results in order of magnitude, noting the 
series, the battery, and the date of each experiment. 
We have 
Date. 
R 0 . 
Series. 
Battery. 
Error. 
Percentage error. 
Dee. 2. 
158T71 
B 
5 Thomson’s . 
-•215 
-135 
Nov. 16. 
158-233 
A 
4 Daniell’s. . 
-153 
-•095 
„ 21. 
158-296 
A 
4 „ . . 
-•090 
-•056 
„ 25 :. 
158-301 
C 
6 Thomson’s 
— "085 
-•053 
Dec. 2 . 
158-368 
B 
5 
-•018 
-•011 
Nov. 23. 
158-397 
C 
5 
•Oil 
•007 
„ 18. 
158-472 
A 
4 Daniell’s. . 
•086 
•053 
,, 16, 18, and 21 . . 
158-564 
A 
2 
•178 
•111 
,,28. 
158-676 
C 
6 Thomson’s . 
•290 
•181 . 
An inspection is sufficient to show that there is no definite order in any column 
but the second with the fifth and sixth, which are consequences of it. The greatest 
difference between any two experiments is "505, and this in 158 is rather less than 
1 in 300, or about *32 per cent. 
Of the actual errors of each experiment from the mean, five are negative and four are 
positive; the mean error itself is only *125 ; the mean percentage error is *078. 
The number of experiments made is too small for the calculation of the probable 
