[PSUBS-MAILIST] Re:Blowing ballast (was: question about general design?)

["Michael B. Holt" <mholt@richmond.edu>]

Ty Alley wrote:
> 
> Michael,
>   Why don't you just go down to your local dive shop and tell them what you
> are wanting to do.  Tell them of your medical condition and that since you
> can't dive, that you are wanting to experiment with designing a submarine.
> They shouldn't look at you too funny since it's all about underwater
> exploration any way.  I'm sure they'll probably think it's pretty cool and
> want to help out. 

Hmmmm .....  

> If they won't sell you tanks for some weird reason, there is always e-bay.
> Tanks, regulators and whatever else you need are there for the bidding and
> most sellers don't care what you do with the stuff.  If you do buy used
> tanks, just make sure they are within hydro.  Maybe this will help.

Thanks.

What does "within hydro" mean?




Mike