psychrometer chart

[John Ross]

Hi Fred,
When I got my unit, it came with a slide rule. Line up the wet and dry and
it points to the RH.
The address on it is, Abbeon Cal Incorporated, 123.SR Gray Ave., Santa
Barbara, CA 93101.
I think I origionally got mine from Pianotek.
Regards,
John M. Ross
Windsor, Nova Scotia.
jrpiano@win.eastlink.ca
----- Original Message -----
From: "Fred Sturm" <fssturm@unm.edu>
To: <caut@ptg.org>
Sent: Friday, March 01, 2002 3:28 PM
Subject: Re: psychrometer chart


> Thanks for the tips. Ron's is a graphic chart with curved, intersecting
> lines. Unfortunately, to read below 20% you need the dry-bulb temp to be
> well above 70 degrees F. Don's two are quite different from one another.
> The chart at http://www.bigelow.org/virtual/handson/humidity.html does
> show a full range of humidities for a full range of temps (Farenheit).
> The web-site at http://www.bom.gov.au/lam/humiditycalc.shtml has a
> "calculator" which gives an output of rel hum when you input dry and wet
> bulb temps (Centigrade). I was interested to find that the chart in the
> former had 19% for dry 70F/wet50F, while the calculator in the latter
> had 11% for 21C dry/wet  10C (Which, if I calculated right are the
> equivalent F and C). Neither mentioned barometric pressure (though I
> assume each used a constant).
> Regards,
> Fred Sturm
> University of New Mexico
>
> Ron Nossaman wrote:
> >
> > At 08:34 AM 03/01/2002 -0700, you wrote:
> > >Can anyone point me to a reasonably complete chart of temps/humidity
> > >levels for a sling psychrometer? The chart I got with mine (ten years
or
> > >so ago) lacked numbers below something like 25%. I really just need for
> > >dry bulb in the range of 65 to 75 degrees.
> > >Thanks,
> > >Fred Sturm
> > >University of New Mexico
> >
> > Fred, try this.
> >
> > http://www-das.uwyo.edu/~geerts/cwx/notes/chap06/Psydew.JPG
> >
> > Ron N
>
>