﻿Electricity on Insulators and Metals. 



265 



Table I. 



Fused Quartz. 



Positive electricity on the quartz when rubbed with 

 flannel, silk, and chamois leather. 



Diameter of specimen 1*2 cm 





Frictional work 



Charge in E.S.U. when rubbed with 



in joules. 



•4885 



Flannel. 



Silk. 



Leather. 



8-827 



4094 



2-518 



•9771 



9-447 



5-038 



3149 



14655 



10077 



5-983 



3-779 



1-9540 



10-392 



6-928 



4-094 



2-4425 



10-581 



7-558 



4-409 



34195 



10800 



8-187 



5-353 



4-3965 



10917 



8-817 



5-668 



5-8620 



10-862 



9-132 



6-298 



7-8160 



10-916 



9-447 



6-928 



9-7710 



10-958 



9-636 



7-118 



12-2125 



10-946 



9-747 



7-492 



14-6550 



10-950 



9-761 



7-557 



Table II. 



Glass. 



Positive electricity on glass when rubbed with flannel, 

 - silk, and chamois leather. 



Diameter of specimen 1*2 cm. 



Frictional work 



Charge in 



E.S.U. when ru 



Dbed with 



in joules. 



Flannel. 



Silk. 



Leather. 



•4885 



2-519 



1-260 



•315 



•9771 



3-464 



3-169 



•629 



1-4655 



4-094 



4724 



•819 



1-9540 



4724 



6-298 



•945 



2-4425 



5-241 



7-085 



1-070 



3-4195 



6-241 



7-557 



1-260 



4-3965 



6613 



8-975 



1-575 



5-8620 



6-928 



9-888 



1-732 



7-8160 



7-873 



10-328 



1-889 



9-7710 



8-819 



10 643 



2-078 



12-2125 



8-820 



10-738 



2-204 



14-6550 



8-818 



10-725 



2212 



