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>Roger Carlson wrote:
>
>        The BMD and the Prism are semi-closed systems.

Do you know who manufactures the BMD and how to contact them?

>        The biggest difference between the two is the flow control used to add
>gas to the loop. The Prism uses a mass-flow valve, basically setting a flow
>rate. The BMD, as I understand it, uses another kind of valve that simply
>dumps 25% of each exhaled breath overboard and out through a nice diffuser to
>keep things quiet.
>        You know, if all you fish guys want is silence, that's not hard.

Did you get a chance to see this in action?  Which unit did you think was 
the most quite in shallow water, the Prism or the BMD.  


Barrie Kovish
Vancouver, Canada
bmk@ds*.bc*.ca*

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