by a Charged Condenser moving! through Space. 161 

 Table II. — Apparatus turned through 180°. 



Central plate charged positively. 



Speed 

 revs. 



, i i , IDeflexion Deflexion 

 central plate, i observecL calculated . 



per mm. 



Volts. 



720 



+4000 | +1 



92 



730 







93 



720 



4-1 9-2 



700 



-3 9-0 



660 



' 4-1-5 1 8-5 



680 



: 4-1-5 8-7 



690 



I 8-9 



680 



I 8-7 



Central plate charged negatively. 



Speed Pot. of 



revs. j central plate, 

 per min. Volts. 



720 

 720 

 720 

 710 

 710 

 700 

 710 

 700 



4000 



Deflexion 

 observed. 







-3 









 4-2 

 -1 











Deflexion 

 calculated 



9-2 

 9-2 

 9-2 

 91 

 9-1 

 90 

 91 

 90 



Table III. — Experiments performed on July 20, 2.55 p.m. to 4.20 p.m. 

 iEther drift horizontal. ^ = 10*6 seconds. 



Central plate charged positively. 



Speed 



Pot. of 



Deflexion 



Deflexion 



revs, 

 per min. 



central plate. 



Volts. 



observed. 



calculated. 



690 



4-4000 



+2 



7-7 



740 





-3 



8-2 



700 





4-1 



7-8 



700 









7-8 



690 





-1 



7-7 



680 





4-0-5 



7-6 



780 





+ 1 



8-7 



740 





-1 



8-2 



Central plate charged negatively. 



Speed 



revs. 



per min. 



Pot. of L _ . 

 central plate, ^flexion 

 Volts. ob s er ved. 



Deflexion 

 calculated. 



8-4 



8-5 

 8-5 

 8-7 

 8-5 

 7-8 



750 

 760 

 760 

 780 

 760 

 700 



-4000 4-3 



1 -1-5 



-1 







j 



4-2-5 



j 



Table IV. — Apparatus turned through 180°. 



Central plate char 



ged positively. 



Speed 



Pot. of 



central plate. 



Volts. 



Deflexion 



Deflexion 



revs. 

 per min. 



observed. 



calculated. 



770 



4-4000 







8-6 



740 





+ 1 



8-2 



730 









8-1 



810 





+4 



90 



810 









90 



830 





4-2 



9-2 



810 





-2-5 



90 



820 





+2 



91 



840 





-2 



9-4 



Central plate charged negatively. 



Speed 



revs. 



per min. 



860 

 880 

 880 

 870 

 850 

 860 

 840 

 800 



central plate. D u eflexio ? Deflexion 

 Volts observed, calculated, 



-4000 



4-1 



96 



-1 



9-8 



4-2 



9-8 



4-4 



9-7 







9-5 



4-3 



9-6 



4-2 



9-4 







8-9 



tkil. Mag. 8. 6. Vol. 22. No. 127. July 1911, 



M 



