ELECTBICAL MEASUBEMENTS 



323 



Some interest lies not alone in that the method is applicable, but that 

 it confirmed the supposition that absorption resistance acts as an ordi- 

 nary ohmic resistance in series in the circuit. This was confirmed by 

 the fact that when condensers were in series and in parallel, their 

 absorption resistances acted under these conditions like ohmic resist- 

 ances, being increased in the one case and decreased in the other, and 

 in the right ratio. This agreement was not exact, as the absorption 

 resistance was extremely sensitive both to change of period and change 

 of temperature. The great sensitiveness to change of temperature was 

 shown either by letting the current go through the condensers for a 

 little time, or placing the condensers before a hot air flue; in either 

 case after cooling, the absorption resistance returned to its original 

 value. The cooling was very slow, as there was very little radiation 

 from the condensers inclosed in wooden boxes. 



The results are now given for the condensers 2 and 3 microfarads. 

 In the calculation of the results the last term of the equation, that is 



7 ry> f nr , 



, , ^- - - 





 condensers 2 and 3 microfarads were used. 



has been left out, as it was very small when 





Condensers 2 and 3 placed before the register and heated for 1 hour : 



7489-7 488-27 713-8 46-534 34-33 12-20 



After standing 1 hours in air at temperature of 12 -2 C. condenser 

 has been open so that resistances have been cooled: 



1240-5 487-8 109- 42-86 34- 8-86 



After standing some little time: 



7482-5 487-8 " 651-6 42-47 34- 8-49 



The above table shows conclusively the heating of the condenser by 

 the current, and the dependence of the absorption upon the temper- 

 ature. 



