( 62 ) 



As it is, however, of importance to be able to use the rtaino 

 resistance for currents of different intensity, it was investigated, in 

 how far the deviation of the electrometer and the difference of 

 potential between the pairs of quadrants are proportional. 



To this purpose the current of two accumulators was conducted 

 through a resistance of 1050 ohm, viz. 400 + 300 + 200 + 100 + 

 100 + 30 + 20 ohm of a tested rheostat. By means of the side 

 plugs the difference of potential could be measured between 500, 

 400, 300, 200 and 100 ohm, in doing which the plug on one end 

 was always connected with the earth. 



In order to eliminate the difference of the indication of the in- 

 strument between the positive and the negative potential of the 

 same absolute value, the current was led in both directions through 

 the resistance ; the two Clark-ccHs A and B were placed together 

 in one cylindric glass vessei, filled with paraffine oil ; the negative 

 pole of A and the positive pole of B were continually in connection 

 with the earth and the others by turns with the eiectroraeter. 



The following table contains the observed positions of equilibrium 

 and the deviations, the smaller values of the deviation caused by 

 1 Clark compared with those of table I are to be ascribed to the 

 gradual weakening of the charging battery ; measui'ed with an 

 electrometer of Braun the 300 Leclanché cells had no more than 

 320 volt. Distance of the scale was 2 meters. 



TABLE II. 



May 5th 189S. 



t = 15°.!. 



