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----- Original Message -----
From: Mike Rodriguez <mikey@ma*.co*>
> That's what I thought.  I hate it when a computer specification says
> it uses "Modified Buhlmann", then doesn't tell you what the hell the
> modification is.  It might as well not tell you anything; you'll still
> have the same amount of useful information.


Why would you want straight Buhlman???

The Buhlman ZH - L16A has sixteen pair of coefficients for the sixteen
half-time compartments.  Modified B and C were further added because the
mathematically ( NOTE: mathematically not empirically derived ) were found
to be not conservative enough in the middle compartments.  So if you want
straight Buhlman you are likely to get bent...

The Modified set B ( which is slightly more conservative ) is generally
useful in calculating tables and the modified set C ( slightly more
conservative ) is generally what computer use.  Modified set C ( which
calculates in real time ) .

It should also be noted that neither of the modified subset B or C will
provide for He and are only used for N2..

In short it;it's the variance in the linear projection of the M - values
that provide for the calculation of the NDL limits.  Computers can be
programmed to monitor the variances between the coefficients in the
intercept at zero ambient pressure ( ie; absolute ) and the coefficient of
the reciprocal slope.  That monitoring is precisely what distinguishes the
modified B from the modified C.  When using the B ( ie; tables ) you are
using planned times, when using modified C you are calculating in real
time,..

So if you want straight Buhlman you can have him, but you'll probably be
reading about this stuff in the chamber..

Later

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