1884.] 



On the Electrical Qualities of Glass. 



493 



o © 

 1TJ Ph 



od 



03 ITj .0) 

 *+H " OS © • 02 r-. 



o hh *5 iac^ B Q 



SaS-1! S6dr 



O &fiO R ^ ^ OH 

 Q Br-} 



CO 



w ° 



^ ^ © fa -P r-H^ 



° ° Sh CO £ • 5? 

 ® CD © O ° -S Q 



rH rH ~ g O ^ 



EH H no -5 Ph 54 r © 



J_, __, © fa 



Sh an ;' H T3 « Ph . 



S S ^ rH lO ^ 



^ l».S * 9 § • 

 rQ rQ _g « B . o 



3 £ O fa § ^ rH 9 



CO CO O 



Ph O 



lO Ph^, 



6 



Q 





Total 

 per- 

 centage. 



0-OOT 





100-148 

 100-0 



0-OOT 

 0-00T 



99-85 



100-372 





Soda. 



2-157 





1-420 

 1'700 



2-156 

 2-884 



6'838 



5-933 



B* 



Potash. 



00 

 05 





3-080 

 8-837 



O Tfi 



rH 



CO OJ 



rH rH 

 rH rH 



0T6-8 



7-899 



2ompositic 



Oxide 

 of iron, 

 alumina, 

 and man- 

 ganese. 



1-750 





2-500 

 1-950 



2 ° 



9 <N 



CM CM 



o 

 o 

 t> 



iQ 



3-357 



Chemical ( 



Mag- 

 nesia. 



rH 



o 





0-014 

 0-198 



0-270 

 0-216 



0-360 



0-288 



















ime. 



o 



K0 

 CM 





CO tP 

 CO CM 

 CO CM 



CM CO 

 .t- rH 

 CO CO 



o 



CO 

 CO 



CM 

 CM 

 CO 





hi 



O 





o o 



© © 



CM 



CM 





<-ti © 



© -rH 

 H g 



1> 



no 



lO 



o 

 ^* 



33-85 



37 -098 

 36 -987 



20-606 

 19 -877 



CM 

 00 

 00 



J> 

 rH 



co 



CM 

 "? 



CM 





Silica. 







O Hft 



o o 



i> rH 



W5 O 

 lO uO 



62 -686 

 62 -263 



O 



\a 



J> 



\a 



58 -85 



Specific 

 resistance 

 in ohms. 



o 



© 



i— 1 £ P 



X 



o o o 



c w to 



rft CM OJ 

 00 I> CO 



O 00 

 O CO 

 i> 00 

 rr CO 



rft co 



CO lO 



lO 



\a 



00 





" 02 



B 



rH t? OS 

 rfl CO 

 HHN 



lO rH 



Tfl TH 



rH rH 



tJ< rH 

 rH 



00 00 



00 

 rH 

 © 



OS 



52 



00 





© 



ft 



CO CO CO 



CO CO 



CM CM 



CO 



CM 



•uaniioads no yxBjfc 



# 



1-1 rH |> 



M 

 rH rH 

 rH 





M 



N 



