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The following is mostly speculation.  I don't have any
specific documentation on the French DC55.  If anyone has
a tech manual on the DC55 I would be interested in trading
for a copy!  

Anyway here is what I think I know about the DC55.  It is
described ( nonspecifically ) in Bennet and Elliot, Second
Edition.  The system works as follows: 

1/5 of every breath is dumped into the water and replaced
with a nitrox mixture (Fs).  The resultant inspired O2 fraction 
(Fi) is given by ( according to B+E):

Fi = Fs -(1-Fs)/rKP

Where r is the fraction (1/5), K is a constant between 15 and 30
and P is the depth in atmospheres.  One immediate problem with
this sort of system is that Fi ( in theory ) rises with depth.
Hence the depth operational range of any mixture is somewhat 
limited.

Barrie

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