Re: ambient preference

[SFreihof@aol.com]

In a message dated 4/14/99 8:02:54 PM Eastern Daylight Time, stymer@home.com 
writes:

<< Good descents are the result of sufficient 'on-demand' air supply so that
 you can keep the ballast tank air volume consistent and keep the sub at
 about neutral buoyancy.  >>

This is not something that I had considered to be a major problem, so I'm 
glad you raised the issue.  My question now is, what is a simple and reliable 
way to maintain neutral boyancy in the ballast tanks automatically?