INORGANIC RESPONSE ! 93 
limbs of the tube are now filled with water, till the 
ends A and B are completely immersed. Connection 
is made with the non-polarisable electrodes by the 
side tubes. Vibration may be imparted to either A or 
B by means of ebonite clip holders seen at the upper 
ends A B of the wire. 
(Qa) (6) 


fi 
MOH = Rr 
N 
RSS 



SN 

gel 


Fie. 55.—SuccesstvE Mopirications oF THE Buock MrTHOD FROM THE 
‘SrraicHt Wire’ (a) to ‘ CeLu Form’ (e) 
When A is excited, current of response in the wire is from less excited B to 
more excited A. Note that though the current of response is constant in 
direction, the galvanometer deflection in (d) will be opposite to that in (bd). 
It will be seen that the two limbs of the tube filled 
with water serve the purpose of the strip of moistened 
cloth used in the last experiment to make electric 
connections with the leading-out electrodes—with the 
advantage that we have here no chance of any shifting 
of contact or variation of surface, the contact between 
