Here's the URL for Fair Radio Sales. In their current catalog on page 11, are the
canisters of calcium hydride used to generate H2 for balloons. The description says
they're used to inflate 4 foot balloons for the Gibson Girl rescue radio. They don't
say whether just 1 canister will do the job, but it does mention that the canisters
are dented, suitable only for recovery of the calcium hydride contained within.
Unused, 2 for $15. plus $3. for an "inflation tube" plus S&H. Looks like it'd be worth
trying before you go on your trip.

http://www.fairradio.com/

Regards,
Erich Kern

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