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free balloon

American  

noun

  1. a balloon, often equipped to carry passengers, that drifts with air currents and whose ascent and descent are controlled by the release of ballast and buoyant gas.


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Contacted by Scientific American, the Federal Aviation Administration said that the agency has comprehensive regulations for U.S. operators to safely carry out unpiloted free balloon flights.

From Scientific American • Feb. 23, 2023

McKinley; Professor Auguste Piccard & aide ballooning into the stratosphere ten miles above Switzerland; Professor Erich Regener sending a free balloon with an electroscope 17� miles above Stuttgart.

From Time Magazine Archive

Professor Auguste Piccard, who broke the altitude record in a free balloon in 1932,* is nearly ready to try for the undersea depth record too.

From Time Magazine Archive

So everybody who walks into Scott's office says, 'How about free balloon rides at five grand?

From Time Magazine Archive

Deriving its power of sustentation from the gas contained in the gas-bag, the free balloon is spherical in form.

From The New Gresham Encyclopedia. Vol. 1 Part 3 Atrebates to Bedlis by Various

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