aerostat

Then other lashings were made while the great aerostat plunged about like a wounded leviathan.

Then the aerostat, as the great bag is called, was unrolled and spread evenly over this.

There isn't as much of that aerostat left as would make a pocket-handkerchief or a walking-stick.

Ten minutes later the aerostat was released from her moorings and rose swiftly and vertically into the air.