free balloon

noun

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.

Moreover, the free balloon was subject to the whims of the breezes.

For an hour or two people were surprised at seeing a free balloon sailing away towards Bulwan.

Suppose a free balloon drifting down the wind to have a sail suddenly hoisted on one side, what happens?

A free balloon, moving in the profound silence of the upper air, becomes an admirable sound observatory.

The free balloon also has a grapnel or anchor for use in landing.

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