>Among the knowledgeable listers, what were they
>filled with? I would guess it might be pretty pricey
>to buy enough helium to fill a barrage balloon
I seem to remember reading about "hydrogen generators" used to fill balloons
in WWII. A chemical reaction was started that gives off hydrogen which was
piped into the balloon. I don't have any references for it - just something
from memory.
Judging by my experiences with medium to large size promotional balloons, you
wouldn't need 100% helium to get it up (so to speak) - I bet could be mixed
in some lesser proportion with air.
Steve Johnston
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