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"Bless my thermometer!" gasped Mr. Damon. "This is terrible!" The airship was plunging and swaying about in the awful gale. "Can't something be done, Tom?"
"What has happened?" cried Mr. Nestor. "We were on a level keel before. What is it?"
"It's the automatic balancing rudder!" answered Tom. "Something has happened to it. The wind may have b