Air-ships, lighter-than-air craft provided with means of propulsion and steering.
This defect was overcome by the use of lighter-than-air gas.
The lighter-than-air craft, which belonged first to the army and then to the navy, were a valuable link between the two wings.
His progress had been theirs in the new science of lighter-than-air engineering.
In the race for actual accomplishment the balloonists, the advocates of lighter-than-air machines, took the lead at first.
Balloons, the most elementary form of lighter-than-air air-craft, unprovided with any means of propulsion or steering.
It now seems to have opened a new era in lighter-than-air navigation.
"The Wright brothers invented the lighter-than-air ship early in the twentieth century," he said.
Not until the eighteenth century did the experimenters with lighter-than-air devices show any practical results.
So are suction, rusting of metals, thunder and lightning and lighter-than-air flying machines.