Smoke generator

From:         Mike McDermott <100447.764@CompuServe.COM>
Organization: CompuServe, Inc. (1-800-689-0736)
Date:         Fri, 29 Aug 1997 04:50:31 GMT
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Can anyone tell me/cite references on how to build a 'smoke' 
generating wand to use in a model wind
tunnel to create smoke trails for flow visualisation?
I have made a few attempts to vaporise kerosene, oil etc with 
small electrical heaters
in the ends of tubes but after some small fires etc I think I 
need some expert advice. 
Mike McDermott