( 476 ) 
The experiments 4 and 5 are made with the 25 m.m. étalon, the 
other ones with the 5 mm. apparatus. In the figure the results are 
graphed. The smallness of the displacements may be illustrated by 
the statement, that the outer components of the triplet 5791 are 
separated 0.500 A.U. from the unmodified position in a field of 
29750 Gauss. The ordinate measuring 0.500 A.U. would be 75 em. 
in the figure. ‘ 
The results 1, 2 and 4; 3 and 5; 6, 7, 8, 9, 10 were combined 
in each case by assigning simply to each mean displacement the 
mean magnetic intensity. The three principal values, thus obtained 
are indicated by crosses. These points and the origin lie very approxi- 
mately on a parabola. 
Inspection of the figure or a simple calculation easily shows that 
the quadratic law is obeyed within the limits of the errors of obser- 
vation of the measured displacements. The magnitude of the dis- 
placement has been measured in the average in each of the ten 
points to within 0.002 or 0.003 A.U. 
In order to show how the values of A2, were obtained, I will 
give the calculation of one case in full. 
. A, 
Amie SR 
a, = 5791 A. E. H=12700 
Etalon 2d=10m.m. R=120m.m. 
(z,° — Am) 
