296 Tables 327, 328. 



DIELECTRIC STRENGTH. 



TABLE 327. — Dielectric Strength of Materials. 

 Potential necessary for puncture expressed in kilovolts per centimeter thickness of the dielectric. 



TABLE 328. —Potentials In Volts to Prodnce a Spark In Kerosene. 



Determinations of the dielectric strength of the same substance by different observers do not agree well. For a dis- 

 cussion of the sources of error see Moscicki, Electrotechn. Z. 25, igo4. 



For more detailed information on the dependence o£ the sparking distance in oils as a function of the nature of the 

 electrodes, see Edmondson, Phys. Review 6, p. 65, 1898. 



Smithsonian Tables. 



