Sytze Stel wrote:

For an couple of weeks a collegue and I, both Dutch AC2's, did the weather
observations during the time a barrage balloon equiped with a thermometer, a
hygrometer and a Robinson windspeed meter went up - an down.
Mr. Ferguson let the balloon rise while mr. McCan, in a hut, read the data
from a screen.
As far as I remember the maximum height must have been around 4000 ft.
Another thing I remember are tiny fluctuations in temperature while looking
at the mercury in the Stevenson screen. Was it possible to measure the wind
direction with height? I don't know.
'Secret squirrel stuff' was not noticed in 1945. Later perhaps, and what
could it be?
All this in september 1945 in Cardington while we were waiting to go to the
Air Ministry Meteorological Training School in Kilburn, London NW.

Gosh! That was a long time ago. I was referring to the 1970's when the
Cold War was still going on. Perhaps the guy was involved in some armed
forces exercise involving Cardington? My only tiny experience with
temperature sounding was with a Graw Sonde at the Met Office Training
School at Shinfield near Reading, again in the 70's.