CHAPTERAS3 
RAWINSONDE BALLOONS 
i Rawinsonde Balloons. Rawinsonde balloons are spherically shaped 
films of natural or synthetic rubber (neoprene) which, when inflated with 
a lighter-than-air gas (hydrogen, natural gas, or helium), are used to 
transport radiosonde flight equipment into the upper atmosphere. The 
cL A 
Inflated Rawinsonde Balloon With Hydrogen 
Figure A3-1. 
Automatic Shut-Off Valve 
1-69 A3-1 FMH#3 
