MET. ACTIVITIES AT KEW OBSERVATORY - From Kew Observatory, meteorological reports are regularly transmitted during the 24 hours of every day to the Central Forecast Branch of the Air Ministry Meteorological Office. These messages include readings of air temperature and humidity, barometric pressure, wind velocity and direction, visibility, rainfall and sunshine. Since the outbreak of war meteorological observations have been carried out largely by women. One of the most interesting instruments used in weather observation is a radiosonde - a self-contained barometer, thermometer and hygrometer
MET. ACTIVITIES AT KEW OBSERVATORY - From Kew Observatory, meteorological reports are regularly transmitted during the 24 hours of every day to the Central Forecast Branch of the Air Ministry Meteorological Office. These messages include readings of air temperature and humidity, barometric pressure, wind velocity and direction, visibility, rainfall and sunshine. Since the outbreak of war meteorological observations have been carried out largely by women. One of the most interesting instruments used in weather observation is a radiosonde - a self-contained barometer, thermometer and hygrometer - which is carried freely upwards by a rubber balloon to heights which may reach 12 miles above sea level. Whilst the instrument is in the air it transmits a complete set of radio signals several times every minute, and these signals are received by a team of operators on the ground. Ultimately the balloon bursts and the radiosonde is gently parachuted to the ground. The falling place may be 50 miles or more distant from the start, but the signals can be received during the whole flight. A reward label is attached to encourage the finder to return the instrument which may frequently be used again. Radiosondes require very careful testing and adjustment before use - some tests are made at temperatures down to 80�Fah. below Zero. Picture issued 1945 shows - Reading the thermometers. These instruments are mounted in a Stevenson screen - a kind of wooden box with louvred walls, which as well as permitting free access of air provides protection from radiation Royal Air Force
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