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Atmospheric data are of importance to the military for e.g. ground artillery and air plane missions. As the Military Weather Forecasting Service shared the same laboratory with the Measurements Building it must have had a hand in the assignment of 1934 and subsequent developments. The requirement was a light-weight construction carried by a balloon and transmitting a composite Morse coded radio signal to read three instruments according to Molchanoff (1928). Comparison with more than ten foreign designs current at that time shows that the final model formed an ingenious combination of a rugged mechanical scanning mechanism for the coding of three outputs and solid overall design. The vertical ascent was initially used to rotate a propeller, driving the scanning mechanism. This first developmental model proved to be unreliable given the allowable extra propellor weight and subsequently replaced by an electric motor.

Readjustment of the requirements and the addition of civilian use delayed the final model. The picture shows the assembly with the meteorograph fitted between flexible leads. The upper one served as antenna. The lower one carried the battery (with cork protected against cold) thus decreasing the shock to the instruments returning to earth. The photographs shows the inside of the meteorograph proper and the outer cover to protect the instruments against rain and sun heat. Some 100 meteorographs were industrially produced between the end of 1939 and May 1940.

Additional information is given under technical details.


Weerballon, samenstelling

General assembly Meteorograph,
interior and outer cover
full size 20 KB)

Meting van ontstekingsruis aan vleugelloos vliegtuig
Launch of balloon
with meteorograph
full size 37 KB)


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