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Curtis,

   You're probably right about pure oxy in an emergency dive bottle, but
how about using a nitrox mix, say, 50% oxygen?  Seems to me this would work
OK for something like an emergency descent, and might fall within the range
of what a dive shop would feel comfortable putting into one of these
bottles.  Dive bottles are already treated pretty much like oxygen bottles -
i.e., no petroleum based lubricants, non-flammable materials, etc.  Pressure
is not an issue, as the dive bottles need to be proof tested according to
PADI or similar standards.  I'm just thinking this might be a relatively
inexpensive and easy-to-find alternative.

   Another possibility is to check out some of the specialty gas suppliers,
like Scotty Specialty gases.  They sell several types of disposable gas
cylinders that are small and inexpensive.

Jim Cameron

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