| 单词 | ballonet |
| 释义 | ballonnet, ballonet|ˈbælənɛt|
Also -ette.
[ad. F. ballonnet, dim. of ballon balloon.]
A balloon capable of being inflated with air, placed inside a balloon or airship to enable it to keep its shape during deflation. Also, one of the sections, filled with hydrogen, of the envelope of an airship.
1902E. P. Lyle in Ann. Rep. Smithsonian 1901 583 The ballonet fills with air automatically from a pump worked by the motor. 1903Daily Chron. 21 Sept. 3/6 In the central compartment is an internal air balloon, or ballonnette. 1907Cornh. Mag. May 609 An internal balloon or ‘ballonet’. 1915Sphere 6 Feb. 152/1 At high altitudes the ballonettes [of the zeppelin] leak, and the covering does not by any means wholly retain the hydrogen. 1916Ibid. 1 Jan. 24 (caption) Sectional view of a zeppelin airship, showing the arrangement of the hydrogen and air ballonets which control the weight of the airship. Ibid. 5 Feb. 143 The balloon is composed of one main elongated ballonet inflated with hydrogen or some other very light gas; a second internal ballonet is inflated with air as required in order to maintain the shape of the balloon. 1916C. C. Turner Aircraft of To-day xiii. 203 All non-rigid and semi-rigid airships are provided with ballonnets. |
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