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Jammer,

You're making too much of this.  Remember the basic principle of Hogarthan -
K.I.S.S.  Building a box and doing volume measurements seem like overkill.
As George pointed out - they are all different in weight.  What you need are
the weights when your tanks are rigged (single or double).

Just weigh the tank(s) full and empty in water; rigged or not, its up to
you.  You should weigh it with the pressure you fill it to and consider what
pressure you are interested in when its near-empty.  I don't see the value
of weighing a totally empty tank.  A strap around the valve or manifold is
just fine to hang it from.

Just go to a swimming pool and a dock or something where there is salt water
and you are on a stable platform.  I'm guessing you want the weight in fresh
and salt water.

In the case of a floating tank when empty, strap on a lead weight to sink it
and subtract after weighing.


Regards,
Tim



At 09:05 PM 10/3/97 -0800, you wrote:
>Here's the plan.

>So what we're going to do, is we're going to build a box.
>
>We're going to stuff a tank into the box, cover it with water, mark the 
>level, jerk the tank out, mark the new level, and then we will have exact 
>dimensions for the displacement of that tank, and can calculate the 
>weight of sea water it displaces.
>
>Then we're going to weigh it empty, weigh it full, and arrive a what we 
>think are the REAL bouyancy figures for that tank.

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