pilot balloon

noun
a balloon for the visual observation of upper-atmosphere wind currents.

Origin:
1840–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pilot balloon
 
n
a meteorological balloon used to observe air currents

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Check to make sure no air is leaking around the tube and feel the pilot balloon for stiffness.
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