modulating and supplying to said second electrode {HEAD ~ an electrode signal} obtained from {TAIL ~ a signal generating means} in the second liquid container, 
obtained from
modulating and supplying to said second electrode { HEAD ~ an electrode signal } obtained from { TAIL ~ a signal generating means } in the second liquid container ,
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH