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The air-ship was still four miles off, and flying at an altitude of about 2000 feet.

The monster air-ship left its hangar and returned to it on schedule time.

The idea of building an air-ship had come to him while he lay dying with scurvy, as they thought, in a Confederate prison, and he had never abandoned it.

On page 45, "air-ship" was replaced with "air ship".

In this way the height of a mountain can be measured, and a man in a balloon or an air-ship can tell at what height he is sailing.