68 
Proceedings of the Royal Society of Edinburgh. [Sess. 
and the E.M.F.’s actually observed at the same loads. The agreement is at 
once sufficiently obvious : from the arrangement of the signs in the column 
Table II. 
Load (kg.). 
Calculated value 
of E.M.F. 
(Volt) 
Observed value 
of E.M.F. 
< 10 6 ). 
Difference. 
0 
0-641 
0-600 
+ 0-041 
1 
3-547 
3-459 
+ 0-088 
2-5 
7-307 
7-120 
+ 0-187 
4 
10-511 
10-300 
+ 0-211 
5 
12-326 
12-141 
+ 0-185 
6 
13-877 
13-718 
+ 0-159 
7*5 
15-685 
15-649 
+ 0-036 
9 
16-855 
16-833 
+ 0-022 
10 
17-262 
17-211 
+ 0-051 
11 
17-362 
17-363 
- o-ooi 
12-5 
16-915 
16-970 
- 0-055 
14-5 
15-148 
15-260 
-0-112 
of differences it seems probable that the determination of the axial in- 
clination has been slightly at fault (rather too large), and that a more 
accurate determination would make the agreement still more striking. 
As it is, the initial assumption that the curve is a parabola appears sufficiently 
justified. 
{Issued separately March 20, 1914.) 
