As {HEAD ~ electrons} flow through {TAIL ~ the external circuit}, schematically indicated by reference numeral 26, alkali metal 16 passes through electrolyte tube 14 in the form of cations 
flow through
As { HEAD ~ electrons } flow through { TAIL ~ the external circuit } , schematically indicated by reference numeral 26 , alkali metal 16 passes through electrolyte tube 14 in the form of cations
OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH