896 Prof. E. P. Adams on Elect'rostriction. 



Table I. 



Glass. 



E. 



K. 



*,-*e*i+* a ). 



3. Ph. R 



N. Tb. R 



641 10 u 



626 



5-51 



6-83 



7-015 



5-12 



5-74 



773 

 8-GO 



6-99 

 6-57 

 661 

 722 



7-07 



• +0-68 

 -0-94 

 -0-45 

 -0 67 

 -2-54 

 -2-57 

 -2-85 



8. Bl. B. II 



7. Bl. R.I 



10. 477 m 4. II. ... 

 12. D. F. R. II. ... 

 16. L. F. R. II. ... 



(7=0-2. 



The glass which Prof. More used in his experiments was 

 apparently more like one of the first two in this table than 

 any of the others. So that while &i + S 2 cannot be deter- 

 mined, it is very probable that it is much smaller than K, 

 and therefore the elongation of a charged open cylindrical 

 condenser given by (12) will be much less than that given 

 by (16), the expression which Prof. More attempted to 

 verify. 



2. Cylindrical Condenser with Non- Adherent Armatures. 



Some of Prof. More's experiments were made with cylin- 

 drical condensers, the armatures being separated from the 

 dielectric tube by an insulating liquid. Let K, as before, 

 be the dielectric constant of the solid tube, and K' that of 

 the liquid. For a fluid §i == § 2 - Let 8 d be the common value 

 of these two constants for the liquid. Let / and g be the 

 internal and external radii of the liquid, a and b, as before, 

 those of the solid tube. The electric intensity in the solid 

 is now 



R = 



K'V 



1 S 



K'loff-H-Kloff?? 



x - = 



¥ 



and in the liquid 

 R' = 



KV 



tog- 



+ Klog 



1 S' 

 — x - = - 

 a a r r 



