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From: <gmirvine@sa*.ne*>
Date: Mon, 02 Jun 1997 08:42:52 -0400
To: John Brett <johnb@pi*.co*.uk*>
CC: techdiver@aquanaut.com
Subject: Re: 25%
John, it "should be" twice as narcotic, but to really get the "truth",
I think the smart thing here is to define aed as the combination of the
gases. When diving mix deep, for example, we have both reduced oxygen
and reduced nitrogen, giving an aed that is actually lower than the
conventional calculation would suggest.

 Let me just say that I use this stuff constantly, and do so under
conditions that demand clarity. Yes, I have experienced this: nitrox is
hardly the answer to reduced narcosis, it is the answer to increased
teaching revenues, and on the surface appears to be something that even
a dive instructor can fathom, when in fact it is so much more complex
than this that I can unequivically say that unless you know what I know
about all of it, I hope yo do not try to do what I do with it - fact.



John Brett wrote:
> 
> <snip>
>   The other problem is that oxygen is more narcotic than nitrogen, so
> elevating the one over the other makes it worse, not better.
> <snip>
> 
> Quick question - is this something you have experienced yourself, or based on
> any research.
> 
> I've heard the usual BS of nitrox - "reduces narcosis" and a number of
plausible but
> unsubstantiated arguments both ways, and would like to know the truth.
> 
> John Brett
> 
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