new Standard of Light. 

 Table (continued). 



399 



i 



P. L. S. 









o 







J V 







'A 







§1 











1 



II. 



in. 



9 cS 

 O (> 



^. 



Kemarks and Particulars. 



© 



producing i' 



producing i 





i 





*S 



d' millims. 



d millims. 



eg J> 







1 



from prism. 



from prism. 



ft § 







5. 



101 



149 



O 



18-8 





Both lights covered up 





101 



149 



18-8 





with glass covers, each 





102 



148 



18-8 





glass cover having inside 





101 



149 







a black paper. 





101 



149 







Current increased by de- 



101-2 



148-8 



18-8 



0-46 



6. 



103 



147 



21 







101 



149 



21 





creasing the resistance of 





101 



149 



21 





the mercury rheostat, but 





101 



149 



21 





kept constant at 21°. 





101 



149 



21 





Clear glass again on both, 





101 



149 







like experiment No. I. 

 Clear glass cover on No. III. 



101-3 



148-7 



21 



0-46 



7. 



104 



146 



21 







103 



147 



21 





No glass cover on No. II. 





102 



148 



21 









102 



148 



21 









102 



- 148 



21 

 21 





Clear glass cover on No. II. 



102-6 



147-4 



21 



0-48 



8. 



101 



149 



21 







100 



150 



21 





No glass cover on No. III. 





100 



150 



21 









99 



151 



21 









100 



150 











100 



150 











100 



150 







Both the clear glass covers 



100 



150 



21 



0-44 



9. 



101 



149 



21 







101 



149 



21 





on. 





101 



149 



21 







101 



149 



21 



046 



The deflection 18° # 8 represents a current =7*82 webers. 

 The deflection 21° represents a current =8*81 webers. 

 From these results the following conclusions can be drawn : — 

 The thin glass covers, as was to be expected, absorb a 



