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Hi George.
My father was a submariner for the U.S. navy and
after Japan surrendered he and the captain went aboard a captured Japanese
sub
and removed some items before they sunk it for
target practice. One of the items my father got is a japanese depth gauge off
the sub.
We still have it today and it appears to be
relatively simple in that it appears to screw to a pipe of some kind and works
off outside water
pressure. It is big as gauges go, about 8 inches in
diameter. I don't know if you are using an ambient sub with a variable internal
atmosphere
or a 1 atm sub that the pressure never changes
internally in. This might make a difference in the gauge's reading depending on
what kind of
gauge you used and whether it was a gauge that
operated from pressure all around the gauge or just pressure going INSIDE the
gauge.
Why not just use a simple depth gauge like the jap
one that worked screwed to a pipe penetrating the hull interior that allowed the
water pressure to come
into the pipe and go inside the gauge to actuate
it? You could put a cutoff valve on the pipe before the gauge so if the gauge
ever failed or came
apart or leaked, you could shut off the water
pressure going to the gauge. I don't understand why you would want to have a
gauge outside the hull
when you could mount it inside the hull. Seems
simple to me. Buy a depth gauge that works from pressure applied to the interior
of the gauge instead
of a gauge that works from pressure all around the
outside of the gauge. Then mount that gauge inside the hull to a pipe that
penetrates the hull that allows
the water pressure to enter the gauge and install a
shutoff valve before the gauge on the pipe. Should this be more complicated? Am
I missing something guys?
Bill Akins.
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