[bronson] construction OF VERY HIGH RESISTANCES 169 



1.28. In order to verify these values, the actual current through the 

 standard for these voltages was measured by the condenser and rate 

 method. The actual resistances were found to be 0.971 x 10", 

 1.14 X 10" and 1.25 x 10^'. The ratio of these resistances is 1:1.17: 

 1.28. We thus see that the two methods agree when fairly large 

 voltages and capacities can be used. For the smaller currents, the 

 use of a decaying radio-active substance is much the best method. 



Of course this high resistance standard, as I have called it, is 

 not a true resistance, because it does not obey Ohm's Law. It does, 

 however, make a very satisfactory substitute, when once a calibration 

 curve has been obtained. 



The results given in this paper would suggest the possibility of 

 making standard vessels, similar to the one here described, and 

 preserving them as permanent high resistance standards. They 

 would have a much higher resistance than any standards with which 

 the writer is acquainted, and ought to remain constant over a long 

 period, if the active material used is radium or some permanent 

 radioactive substance. 



