This reminds me:

I remember an Electronic Design article where Bob Pease made a wind speed
detector out of a small light bulb with the glass broken away.

He had a constant current circuit setup and (I believe) measured the voltage
required to generate the current. Also took into account temperature with a
thermistor.

This resulted in the airspeed, as the resistance of the bulbs filament
depends on temperature - and the faster heat was carried away by the moving
air the higher the resulting voltage would be.

Specifics may be way off, but that was the idea.

Maybe start your search here:
http://www.elecdesign.com/

Bruce.

-----Original Message-----
From: Scott F. Touchton [mailto:Scott.Touchton@US.JDSUNIPHASE.COM]
Sent: Tuesday, February 13, 2001 10:53 AM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: Wind Speed Formula??


This might be a little far out, but why not use relative humidity
measurements
in reverse?  Seems as if the temperature measured would be directly related
to
humidity and wind speed (wet bulb).  Just a thought.

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