"Andy Morse" wrote in message
...
Dear All,

I am collaborating with a health research group in Niger, west Africa
who want to install climate stations at over 40 sites. Their budget
is limited and would appreciate a copy of a plan to construct
Stephenson Screens locally. I have looked on the Internet for such
information so far with no success

.... unfortunately you have used the wrong name: it's STEVENSON screen.
Put that phrase into a search engine (I've just checked in Google) and
you will come up with plenty of entries ... here is just one:

http://home.surewest.net/twitham/wx200d/data/shade.html

Martin.