667 



Capacity determinations gave tiie furtlier result that the caj)acit3' 

 amounted to 5.75 e.s. units for the state (-f- 20,0 — 3) measured from 

 an angular displacement (recession), corresponding to 550 mm. scale 

 displacement, whereas it gave the value 6 e. s. units, when this dis- 

 placement only extended over 250 mm. 



Measurement of the current. 



With the different above mentioned states of charge ionisation 

 currents were measured, obtained with two different very slight 

 quantities of polonium, which were placed in a dish on the bottom 

 of ƒ; the larger quantity is called A, the smaller B. The velocity 

 with which the scale moved under the cioss wire was determined, 

 and then the intensities of current were derived in absolute measure 

 from this by means of the knowledge of the capacities and potential 

 sensibilities holding for some of the states of charge. 



The curves II represent the result of the measurements for the 

 quantity A ; it appears from this, that in accordance with expecta- 

 tion the sensibility of charge increases for states with greater potential 

 difference between a and h ; at the same time this confirms what 



60 



40 



CD 

 P 

 CD 20 



c3 





xoo 

 Fig. 2. 



seconds 



400 



was discussed before, that namely the sensibility of charge foi' one 

 and the same state is greatest, when a is nearest h. 



From the experiment in itself the ratio of the current intensities 

 of the two quantities of polonium could already be derived, and 

 that even for each state of charge taken by itself. It will namely be 

 equal to the ratio of the times required by a to pass through the 

 same angle for the quantity .4 and for B. This ratio, which would 

 have to yield the same value for every state of charge, amounted 

 successively to 2.5, 2.7, 2.7, mean 2.6. 



According to the above it was now^ possible at the same time 

 by means of the measured capacities and the known potential sen- 



