Alkali metal such as sodium within tube 14 is heated to {HEAD ~ a temperature} of {TAIL ~ from about 300 to 1000 degrees C.} by suitable means known in the art 
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Alkali metal such as sodium within tube 14 is heated to { HEAD ~ a temperature } of { TAIL ~ from about 300 to 1000 degrees C. } by suitable means known in the art
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH