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see weather balloonweather balloon,
balloon used in the measurement and evaluation of mostly upper atmospheric conditions (see atmosphere). Information may be gathered during the vertical ascent of the balloon through the atmosphere or during its motions once it has reached a predetermined maximum
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The tetroons allow us to measure atmospheric activity where the insects are doing their thing."
But that's not the kind of hot air balloons featured in "The Hot Air Balloon Book: Build and Launch Kongming Lanterns, Solar Tetroons, and More", an impressive do-it-yourself instruction book for ages 9 to 99 showing how to construct and operate an impressive variety of eight different hot air balloon constructions.
Westbrook attached radiomicrophones provided by McCracken to helium-filled balloons called tetroons. They listened to the audio signals transmitted while the tetroons drifted at an altitude of about 2,500 feet.