ingo wrote:
> 
> in <3A4EA1E7.EA26A5C0@online.no> Tor Olav Kristensen wrote:
> 
> >I find these optical properties very fascinating.
> >
> 
> Nice stuff to play with.
> Here's a realy old one I dug up.
> <http://members.home.nl/seedseven/stress_test.jpg>
> Top is between crossed pola's.
> Bottom, a 1/4 lamba plate is added (I think).

Very clear illustrations of the phenomena,
but what is a 1/4 lambda plate ?


> With a polarisation microscope I made hundreds of pictures of
> minerals and "schliffs" from bore hole samples while I worked
> for an oil company.

I didn't know that minerals had these properties as well.

Did you use some kind of (semi-)transparent minerals ?

Do you know of any "everyday" mineral materials that I 
could use for experimenting ?

And what are "schliffs" ?


Regards,

Tor Olav
-- 
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html

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