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                                                                    4:12 PM
  OFFICE MEMO                                                 Time:
                      Subject:
                      None                                          7/5/94
                                                              Date:

 tbengtson@VN*.IB*.CO* (Tim Bengtson) wrote:

>As I recall, the device in question was designed to breathe very hard
>if the user got below the designed operating floor.  Granted, this is
>no guarantee that a determined user couldn't find a way to hurt himself
>with the rebreather, but it sounded like the manufacturer took CNS O2
>tox into account. 

Yes, the manufacturer did try to limit the ability of people using this to
*experience* O2 toxicity. They set up the rebreather to work at 80 percent
O2 (PPO2 of 1.6 at 33 ft). But it (IMHO) would be real easy to go deeper than
that. 


> Because the flexible tubing expanded and contracted
>with the user's breathing, I noticed that everyone seemed to breathe
>in quick, shallow breaths, although it's not possible to know whether
>that was because of some inherent design flaw or simply nervous 
>divers.

As for hard to breath, I wonder if the people using this device get CO2 
hits (making O2 toxicity MORE likely)?

>Ten minutes at fifteen feet definitely puts this thing into the toy
>category but for its price... 800 USD.  That's one of my biggest
>problems with the show "Beyond 2000"; more often than not, they trot
>out gadgets that are impossibly impractical, gush over them for five
>or ten minutes, and then say "Gee whiz" at the end.  Gag.

Oh well... which one of DOESN*T have some expensive toys?

>Tim

Steve

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