308 Dr. J. C. Bose. On the Influence of the Thickness of 



When radiation is absorbed by the receiver the resistance is decreased 

 and this diminution of the resistance is found from the new balancing 

 resistance. 



Fig. 3. — G, the differential galvanometer; E, the receiver; 

 r, the resistance box. 



All observations agreed in showing that as the thickness of 

 air-space was gradually decreased, the transmitted component was 

 increased, with a corresponding decrease of the reflected portion. 

 I give below two sets of observations, in which the receiver acted 

 better than usual. The results are to be taken more as qualitative, 

 as no reliance can be placed on the sensibility of the receiver being 

 absolutely uniform. 



Radiator R 2 ; distance between the sparking surfaces = 10" 1 mm. 



Thickness of air- 

 space in terms Of 

 number of cards. 



Thickness 

 in mm. 



Galvanometer deflec- 

 tion due to the 

 reflected portion. 



Galvanometer deflec- 

 tion due to the 

 transmitted portion. 



1 



0-45 



or very slight. 



Agsinst the stop. 



2 



0-90 



Slight 





4 



1-8 



80 



160 



8 



3*6 



145 



150 



10 



4-5 



150 



120 



12 



5-4 



160 



100 



16 



7*2 



Against the stop 



30 



18 



8*1 



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