A difference in alkali metal vapor pressure on the opposite sides of {HEAD ~ electrolyte tube} 14 results in the creation of a difference in {TAIL ~ electrical potential} across the electrolyte 
A difference in alkali metal vapor pressure on the opposite sides of { HEAD ~ electrolyte tube } 14 results in the creation of a difference in { TAIL ~ electrical potential } across the electrolyte
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH