( w ) 



TABLE III. 



Deviatiou. 



Difference of potential in volt. 

 Observed. Calculated. 



Inteusity of the 



current 



iu ampere. 



Clark B — 49S.1 1 



Clark A + 496.8 ] 



I 662.2 1 



/ 659.9 j 



/ 5?8.4 1 



I 529.9* S 



/ 397.0 ^ 



600 a 



400 il 



300 a 



200 n 



100 n 



( 396.1 ) 



( 264.0 j 



\ 264.0 ) 



( 131.9 I 



/ 131.6 . \ 



—498.5 1 



Clark B 



Clark A -\- 497.0 



497.5 



661.1 



529.2 



390.6 



264.0 



131.8 



497.7 



1.524 



1.143 



0.7617 



1.905 



1.524 



1.143 



0.7615 



0.3810 



0.003801 



0.003810 



0.003811 



0.003811 



0.003805 



Because of the slight difference between the deviation of' 1 Clark 

 and the difference in potential at tiie ends of a resistance of 400 

 ohm, the proportionality between the deviation and the difference 

 of potential was assumed, from whicli 1.524 V. was derived; 

 accordingly the intensity of the current was 0.003810 ampere; 

 if we multiply this value with the value of the resistances — taking 

 the very slight corrections into consideration — we find the „calcu- 

 lated" differences of potential. Under „observed" differences of 

 potential the values have been given which are found in the sup- 

 position of proportionality between deviation and difference of potential. 

 It will appear that this proportionality ranges within pretty wide 

 limits. The same fact is also shown in the last column where the 

 intensity of the current is calculated by dividing the observed diffe- 

 rence of potential by the resistance. It is a matter of course that 

 the deviations are reduced to angles. 



If care is taken that the angle through which the needles are 

 moving, does not exceed 7°A, (agreeing with the deviation 529 by 

 reversal) and that the deviations do not become too small, so that 



