300 Dr. E. H. Barton on the Attenuation of Electru 



Table 1. 

 Showing electrometer readings for Z x = 65 m., Z 2 = 48 ra. 



Electrometer- 



throws with 







Absorbing B 



•idge only at 



Electrometer-throws with 



Ratios of Throws, 



end of Line. 



Reflecting 

 at 48 m. -A/8 



I Bridge 

 at 48 m.+X/8 



viz. 

 col. 3 



col. 4 







Actual 



Interpolated 



beyond the 



beyond the 



col. 2 



col. 2 ' 



observations. 



means. 



Electrometer, 



Electrometer. 





' 



20 















21-5 



66 





307 





23 















23 





63 



... 



274 



23 















23-5 



80 





340 





24 















24-5 





77 





314 



25 















255 



80 





314 





26 















27 





75 





2-78 



28 















27 



82 





304 





26 















24 





72 





3-00 



22 















245 



79 





3-22 





27 















27 





71 



... 



263 



27 















27 



78 





2-89 





27 















26-5 





72 





2-72 



26 















27 



81 





300 





28 















27 



, . 



77 





2-85 



26 















265 



76 





2-87 





27 















27 



• . . 



78 





2-89 



27 















275 



78 



... 



2-84 





28 















26-5 



. . . 



76 



... 



2-87 



25 















26 



79 



... 



304 





27 















24-5 



• .. 



72 





2-94 



22 









i 







Whence Final Mean Ratio = 



2 955 ± 00254 



