694: Dielectric Strain along the Lines of Force. 



Tube 7. — Non-adherent Armatures. 



The table shows that the deflexions, though somewhat less, 

 are not nearly so small as they should be. This would be 

 accounted for satisfactorily if we believe most of this 

 elongation to be caused by the heat evolved. Again, the 

 influence of time of charging is clearly shown. The values 

 on different days seem to be consistently different. I cannot 

 account for this except to suppose that the humidity was so 

 different on the two days as to cause a great variation in 

 leakage currents and so a difference in the heating of the tubes. 



Tube 9. — Non -adherent Armatures. 



Spark- 

 length. 



Potential. 



Elongation 

 micr. div. 



Elongation 

 ^xlO 4 . 



Time of 

 charging. 



10 mm. 



100 C.G.S. 



80 



4-8 



1-00 mm. 



10 



100 



55 



3-3 



0-75 



10 



100 



35 



2-1 



0-50 



10 



100 



25 



1-5 



025 



10 



100 



75 



4-5 



1-00 



10 



100 



30 



1-8 



0-25 



10 



100 



35 



2-1 



0-25 



10 



100 



42-5 



2-6 



025 



12 



110 



130 



7-8 



1-00 



12 



110 



115 



6-9 



100 



12 



110 



115 



6-9 



1-00 



12 



110 



85 



51 



0-50 



12 



110 



77 



4-6 



050 



12 



110 



82-5 



5-0 



0-50 



12 



110 



70 



4-2 



050 



14 



120 



150 



90 



0-50 



14 



120 



150 



90 



0-50 



14 



120 



165 



9-9 



050 



14 



120 



145 



8-7 



050 



14 



120 



165 



9-9 



0-50 



14 



120 



160 



9-6 



0-50 



14 



120 



150 



9-0 



0-50 



