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Re: Weird ideas [humidity gauges]
From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent: Sunday, December 14, 1997 9:52 AM
To: Tesla List
Subject: Re: Weird ideas [humidity gauges]
On Monday, December 08, 1997 10:28 AM Russ Thornton
[SMTP:ThorntoR-at-rc.pafb.af.mil] wrote;
> Heck, I make my own relative hygrometers for nothing! Just glue about a
> 1/8" wide cutoff of endgrain wood( from a board about 8" to 12") to a
> strip of metal or plastic. I particularly use a piece of the new PVC
> venetian blinds. Mount any way you want. Mine will deflect from 0 to
> about 45 degrees when it is very dry in the house. Of course I am about
> as cheap as they come.
You can make a hygrometer out of almost any hygroscopic material combined
with a non-hygroscopic material. The principle being that the
hygroscopic material will shrink and expand dependant on the humidity
due to water absorbtion. This material is glued to a backing of a
non-Hygroscopic material and then the pair will bend towards or away from
the side of the hygroscopic material accordingly. Most of the commercial
hygrometers sold in "wheather" sets comprised of a Hygrometer, a barometer
and a thermometer are built out of paper and aluminum foil. One can also
use the wet bulb/dry bulb thermometer technique sometimes called a sling
psychrometer, it is described in almost all books on wheather prediction
and especial books on wheather instruments!
Sincerely
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Alfred A. Skrocki
Alfred.Skrocki-at-CyberNetworking-dot-com
.ooo0 0ooo.
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