I recall reading that the orifice was a block of porous ceramic.

   Jim

Sender: Mike Rodriguez  Date: 9/21/99 2:51 PM

>At 03:23 PM 9/21/99 +0800, Stephen Kamarudin wrote:
>
>>The reason I am emailing is that I have an old mechanical decompression meter
>>(circa 1960's I think?) and would appreciate any information that anyone out
>>there in the techdiving world might have on this piece of equipment.
>
>I think that thing uses a fixed orifice in a sealed chamber connected
>to a small air-filled bladder.  Compression of the bladder moves air
>into the chamber and decompression moves air back to the bladder.  The
>size of the bladder is indicated on the meter with calibration to
>indicate decompression information.  It's certainly not a good
>approximation of actual tissue gas-loading.  The device is
>commonly referred to as a 'bend-o-matic'.  :)
>
>-Mike Rodriguez
><mikey@ma*.co*>
>
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