Re: periscopes

[Chris Nugent <dirkpitt77@yahoo.com>]

     Yeah,  I thought just a non-retractable one would get me by. 
Thought it might be cheaper to go the periscope route than to invest in
some kind of listening device.  Thanks for the info tho....

                                 Chris

--- Paul Suds <paul_suds@hotmail.com> wrote:
> Hi Chris, A good college physics textbook will have
> some easy descriptions 
> of optics. I was looking through Psubs web page the
> other day and was amazed 
> at how much info is there. In fact, I think there
> was something on 
> periscopes, but I don't think it went into too much
> detail. I really would 
> not design my sub with a periscope. Seals are
> difficult, if you want a 
> retractable one, and I'm not too sure what it will
> buy you. Having 
> communications with a surface craft is ideal,
> otherwise good acoustic 
> sensors for detecting oncomming watercraft would be
> an alternative. Also, 
> what would stop an oncomming surface craft from
> running into the periscope, 
> Ha.
> Suds
> 
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