The heat tongue is metal and in {HEAD ~ a preferred form} may be formed of {TAIL ~ brass} 
The heat tongue is metal and in { HEAD ~ a preferred form } may be formed of { TAIL ~ brass }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL