-=> Quoting Gregory Procter to Alec Cameron <=-
 GP> There were suggestions from engineers that other gases
 GP> than water could be used in a closed cycle system.
 GP> (I know, water isn't a gas :-)
 
         Mercury has actually been used in some fixed
installations.  It has the disadvantage of being very
expensive and also poisonous.  But it can be operated at
very high temperatures.
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