  Halothane vaporizer.  
Halothane is C2HBrClF3, basically a chlorofluorocarbon of the ozone-depleting variety.  But surprisingly, it's also a very widely used surgical anesthetic.  This vaporizer is used for administering the gas to patients and has controls for carefully adjusting the dose. 
Source: eBay seller i_sell_tech 
Contributor: Theodore Gray 
Acquired: 28 February, 2009 
Text Updated: 1 March, 2009 
Price: $100 
Size: 8" 
Composition: C2HBrClF3
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