Potts — Rowland's New Method. 



113 



SUMMAEY. 



From the above it appears that the method described is a 

 perfectly good method for the measurement of electric absorp- 

 tion. In all cases tried the electric absorption has acted as a 

 resistance in series with a capacity. This resistance is inde- 

 pendent of the current. The temperature has a decided effect. 

 The value of this absorption increases very rapidly with rising 

 temperature. The theory as given above appears to be verified 





9 



l-xl0 4i 

 5-xlO 3 - 



yS />"• cycle. fier t.c. cf Ire. 



1-xlO 4 



3-xlO 4 



5-xlO 4 



1-x 10 4 



9-xlO 4 



by the results in as far as a condenser possessing electric 

 absorption may be considered as a capacity in series with a 

 resistance, both of which depend upon the period of the cur- 

 rent. While the variation is in the proper direction in each 

 case, its rate of change with the period does not agree with the 

 theoretical formula, especially in the case of the wax and paper 

 condenser. 



It also appears that the method given is a good one for the 

 determination of the capacity of a condenser, which shows 

 electric absorption. If electric absorption is corrected for, the 

 capacity of such a condenser is a quantity which can readily be 

 determined, and may be compared with a self-induction stand- 

 ard to 1 part in 1,000. It also appears that no correction is 

 necessary for the electrostatic action of the turns of the stand- 

 ard coil on one another, at least if the relative size of coil and 

 condenser is properly chosen, and if the resistance of the coil 

 is not too large as compared with the total resistance in the 

 branches of the circuit. 



The method given for the detection of short circuits in coils 

 proves to be an exceedingly sensitive one. 



The method described for the measurement of losses due to 

 hysteresis and Foucault currents gives very good results. Its 



