232 



Journal of the Asiatic Society of Bengal. [June, 1914 



DIAGRAM I 



Volts/min 



0*025 



Lean of Quadrants 



0'020 



0'015 



O'OIO 



0-005 



Hours after closing case. 



As it was obvious that no improvement could be expected so 

 long as the electrometer case had to be kept open during a 

 series of measurements, modifications were introduced so that 

 it became unnecessary to open the case at all. The glass front 

 was rep aced by teak, with a mica window for the ray of light 

 to the mirror, and with four very small holes through which the 

 threads passed to connect with the key. As the needle was 

 suspended by a quartz fibre, an arrangement was added so that 

 when necessary it could be charged from the outside of the case, 

 by connecting the phosphor bronze strip to one terminal of a 

 battery and then screwing it up, against a spring, into connec- 

 tion with the suspension. 



