| 21. | He has made attempts to travel to Paris with his dirigible airship.
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| 22. | The military was interested in helium for balloons and dirigibles.
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| 23. | Woodhouse thought that the dirigibles had potential as aircraft for the future.
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| 24. | Goodyear only has blimps but has designs for dirigibles.
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| 25. | A powered, steerable aerostat is called a " dirigible ".
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| 26. | The dirigible, or airship, was developed in the early 20th century.
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| 27. | Such trials as were made were carried out with the dirigible held captive.
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| 28. | It was pumped from one dirigible to the other.
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| 29. | He invented also a wireless dirigible torpedo for the Japanese Government in 1907.
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| 30. | Mr . Eisenstaedt once climbed atop a dirigible in midflight to photograph its crew.
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