A drinking vessel 38 in which a beverage, for example a draught beer, is to be served is cooled by formation thereon of {HEAD ~ ice} formed of {TAIL ~ frozen potable liquid} for example a small volume of the same beer 
formed of
A drinking vessel 38 in which a beverage , for example a draught beer , is to be served is cooled by formation thereon of { HEAD ~ ice } formed of { TAIL ~ frozen potable liquid } for example a small volume of the same beer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH