On Fri, 23 May 2008 at 09:45:03, Martin Rowley
wrote in uk.sci.weather :

... bought mine from Casella back in the 1970s (?1975 I think). Still
got it, still works fine - never any problems with breakage (if the
thermometers are held firmly in the 'cage' then there should not be);
problems to watch out for are of course getting into the routine of
reading the value quickly (and that gets difficult as you get older
and the eyes don't focus so well), shielding from the sun, choosing a
spot which represents where you are trying to measure data etc.

Also, I find, even after all these years, that the process of getting
the wick sleeve onto the wet bulb is fiendishly difficult! It's
annoying as the wick should be un-contaminated by dirt, grease etc.,
and handling via fingers isn't advised!

ISTM that RH & DP are two of the hardest parameters to measure - even
two instruments side by side can record quite different readings.

*****

On a totally separate issue, I just bought myself a TN2 Infrared
Thermometer

http://www.thermometers4u.co.uk/details.cfm?prodID=38

Not because I intend to make serious use of it, but because I love
electronic gadgets (I bet I'm not alone in that here).

It's interesting to see the wide variation in surface temperatures over
very small distances, though.
--
Paul Hyett, Cheltenham (change 'invalid83261' to 'blueyonder' to email me)