Re: [ATM] low voltage heating elements.

[Dale Eason <atmpob@yahoo.com>]

 Using this kind of cooling only works if the humidity
is low enough.  Look for charts for how to determin
humidity using a wet bulb and dry bulb thermometer
(wet bulb hygrometer?).  You can find one here 
http://www.digitemp.com/wetbulb.shtml


--- scott <srychnov@chem.ps.uci.edu> wrote:

> 
> On Sep 7, 2004, at 11:08 AM, Don Clement wrote:
> >
> Don,
> 
>  I am thinking of active cooling
> with a "damp sponge" 
> attached to the back of the mirror and a fan blowing
> over it.  I did 
> some tests a while ago with a fan and digital
> thermometer, and the damp 
> sponge approach cools mirrors very quickly but can
> overshoot--and thus 
> dew out your primary.
> 
> Scott
> 
> 
> 
> > Here is low voltage DIY circuit that automatically
> keeps optics a small
> > amount above ambient and minimizes wattage,
> battery life, and the 
> > effect on
> > seeing.
> http://mysite.verizon.net/res0owmd/id1.html Cost is
> about $10 
> > in
> > parts.
> >
> 
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> ATM mailing list http://www.atmlist.net/
> 


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