SHUDDEMAGEN. — RESIDUAL CHARGES IN DIELECTRICS. 



495 



After the preliminary experiments had been made the whole net- 

 work of conductors was overhauled, and many of the joints were soldered 

 with the help of white pitch as a flux. Sometimes in the later work 

 the 50 microfarad condenser was connected across the poles of the 

 charging battery but seemed not to be necessary. Local conditions 

 made it difficult to bring the coil of the d'Arsonval galvanometer quite 

 to rest and some of the throws had to be made when the coil was swing- 

 ing over a double amplitude of half a millimeter. 



In the tables given below the charging intervals are expressed in 

 terms of the amount of the lead cut through by the knife point. It 

 was calculated that 



1 centimeter means 0.0017 seconds of charge 



ti 



Observations, March 10. 

 TABLE XX. (Figure 7.) TABLE XXI. (Figure 6.) 



" Par. A " vs. Air. 



Par. BB " vs. Air. 



