I
27
KINETIC ENERGY OF ELECTRICITY IN MOTION [I]
caused by them certainly vanishes in comparison with the
error due to the observations themselves.
The observations and calculations performed in the manner
already explained gave the following results:-
1. BRANCHES TRAVERSED IN LIKE DIRECTIONS.
Primary Current in
Scale Divisions of
tangent Galvan-
ometer.
Simple Extra-
Current in Scale
Divisions of Galvan-
ometer.
Primary Current in
Scale Divisions of
tangent Galvan.
ometer.
Simple Extra-
Current in Scale
Divisions of Galvan-
ometer.
152.7
1.121
78.9
0.561
75.7
0.551
78.4
0.548
93.6
0.673
74.2
0.549
116.4
0.831
145.2
1.065
67.6
0.478
By reduction to a current of 100 scale divisions we get
the values 743, 728, 720, 714, ·707, 711, 701, 737, 733.
Mean = 7213, with a mean error of 00137 or 1/50 of the
whole value.
2. BRANCHES TRAVERSED OPPOSITELY.
Primary Current.
Extra-Current.
Primary Current.
Extra-Current.
152.7
0.2088
150.5
0.2025
152.7
0.2051
116.1
0.1443
140.1
0.1872
228.9
0.3992
139.0
0.1817
By reduction to a current 100 we get the values 0.1367,
0.1344, 0·1337, 0·1307, 0·1345, 0·1243, 0·1382.
The large deviation of the sixth observation from the
others is evidently due to some special error, and it will be
rejected. The others give the mean value 01348, with a
mean error of 0.0028 or about 1/50 of the whole value.
The ratio of the two extra-currents observed,
7213
1348
= 5.352,