Harrison,
    I will be very brief as I am leaving in hours for Tally and still have 
to study for midterms.
    The CNS clock refers to O2 exposure table (1.6 for 45 mins, etc), but 
does so as a percentage.  Obviously the 100% is equivalent to the maximum 
single dose exposure.
    The clock references exposure dose (PO2) by time, but stops at 
1.6.  Higher PO2s are not recommended.
    I do not want to say the "clock" is too conservative, for it is based 
on a continuous exposure at the referenced PO2, and does not take into 
consideration back gas breaks, etc.  Thereby the clock does not accurately 
represent what is SOP for some operations, and becoming SOP for many 
divers.  For what the clock is designed to represent, it does a good job; 
for what is reality, yes the clock is very conservative.  Reality being 
using the correct procedures for handling this risk.
    The safest approach to this is an educated one.  There are many factors 
that affect the body during decompression, hydration level, ASA intake, 
activity level, position, fitness, VO2, etc.  The use of back gas breaks is 
of critical importance.  Dropping the PO2, and reducing the problems that 
are associated with it, goes a very long way in handling this risk.  I will 
not wager to say what the "correct" limits are, what works for us, may not 
work for others.  Following known and validated decompression schedules 
with appropriate measures to handle the risk of oxygen exposure, is your 
best bet.

  TO THE LIST:  I apologize for being delayed in the continuation of the 
oxygen series of posts.  As you have read I was entertained last night by 
"Black the Quack" and spend today at the hospital with Heather (she is 
fine, turned out to be only a viral abdominal infection).  As the saying 
goes "I am so far behind I will never die", but I will catch up and plan to 
post the CNS info Sun evening.  Thanks for your patience.
Sincerely,
Scott Hunsucker
At 09:42 AM 02/17/2000 -0700, Harrison Jenkins wrote:
>List:
>I've been following this thread, as I've found it to be very interesting,
>but I'd like to make sure that I've got it straight.  The CNS clock that

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