Dew point can either be measured by an electronic system which calculates
the values from individual (but sometimes combined) air temperature and
humidity sensors or if you want to do it simply, get two thermometers and
keep the mercury bulb end of one of them covered by a damp cloth sock (the
wet bulb temperature). The dew point can be calculated from formula or
tables you will find on the net eg
http://www.srh.noaa.gov/elp/wxcalc/wetbulb.shtml (there is a very small
effect due to barometric pressure)

You can get these as combined units lookink like an old football rattle
where they will come with the convertion tables included eg.
http://www.met-check.co.uk/a04.html

If you want to set something up, you might consider a wireless option such
as http://www.valcoelectronics.com/oregon/wmr968.htm. The only downside
here would be when temperatures dip to freezing the battery performance
effect tends to hit the accuracy, then die completely.




"pol" <pol@polstuff.co.uk> wrote in message news:3ce0cf1c@212.67.96.135...
> Hi Guys
>
> Can anyone tell me how to calculate Dew Point? What would I need to know
> (that can be readily found standing in my garden at about 20' AMSL) like
air
> temp, current air pressure, relative humidity.
>
> I'm also thinking of buying one of those wind speed and direction sensors
> that sailors put on the top of their masts. I'll put the sensor on the
roof
> and the remote readout mounted on my bedroom wall. Has anyone tried this
and
> have some advice? (Don't worry Rod, it's for personal use only ;-)
>
> Thanks in advance
>
> pol
>
>

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