Unmanned balloon

In 1783, Jacques Alexander Chales, a French Scientist, launched the first hydrogen balloon flight. Known as Charliere the unmanned balloon flew to an altitude of 3 km. Three months later. 

NBS curve is mean of June and July measurements obtained in 18 unmanned balloon flights using phototube and filter ozone meters. NGS measurements obtained with spectrograph in manned balloon. Regener measurements obtained with spectrograph in unmanned balloons... 

Figure 10. Vertical distribution of ozone (indicating double maxima) over Nev/ Mexico in 1950 using spectrographs in unmanned balloons...

Data from unmanned weather balloons and weather satellites,... 

Platforms manned-unmanned aircraft, balloons, trains, vans In situ or remote sensors with 0.01 to 10 second response Remote Sensing (Trends and Distributions)... 

As a less expensive, but less reliable, platform for infrared observations, high-altitude balloons have played an important role. Balloons offer much higher altitudes than aircraft and can provide observing times as long as several days under favorable conditions. The observations must be either preprogrammed or remotely controlled. Attitude control is somewhat harder with a balloon platform, and the descent phase can be hard on the equipment. Modern balloon astronomy flights are unmanned. An early NASA... 

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