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From: Tor Olav Kristensen
Subject: Since there no longer is a off-topic group ...
Date: 30 Dec 2000 22:02:47
Message: <3A4EA1E7.EA26A5C0@online.no>
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... I take the chance to mention here that I have
just uploaded an image to my web site that shows an
example of how a normal BIC ball-point pen looks
when illuminated with polarized light and then
photographed through a macro lens with an attached
polarization filter.
To view it, click on the 3rd hyperlink on this page:
http://www.crosswinds.net/~tok/MacroImage.html
I find these optical properties very fascinating.
Tor Olav
--
mailto:tor### [at] hotmail com
http://www.crosswinds.net/~tok/tokrays.html
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Tor Olav Kristensen wrote:
> ... I take the chance to mention here that I have
> just uploaded an image to my web site that shows an
> example of how a normal BIC ball-point pen looks
> when illuminated with polarized light and then
> photographed through a macro lens with an attached
> polarization filter.
Cool, iridescent! (er, photoelastic!)
--
David Fontaine <dav### [at] faricynet> ICQ 55354965
My raytracing gallery: http://davidf.faricy.net/
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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).
With a polarisation microscope I made hundreds of pictures of
minerals and "schliffs" from bore hole samples while I worked
for an oil company.
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
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From: Mick Hazelgrove
Subject: Re: Since there no longer is a off-topic group ...
Date: 31 Dec 2000 05:29:13
Message: <3a4f0a79$1@news.povray.org>
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I remember using polarised images of crystals when we did "light shows" in
the seventies. They have always fascinated me.
Mick
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Tor Olav Kristensen wrote:
>
> ... I take the chance to mention here...
There is nothing wrong with your action...
> I find these optical properties very fascinating.
As do I. Well done !
--
Ken Tyler - 1400+ POV-Ray, Graphics, 3D Rendering, and Raytracing Links:
http://home.pacbell.net/tylereng/index.html http://www.povray.org/links/
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The inside of paprika? Dear man, but my god! The codliver oil I can
undestand, however Paprika is taking it just too far!
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From: Tor Olav Kristensen
Subject: Re: Since there no longer is a off-topic group ...
Date: 2 Jan 2001 20:49:14
Message: <3A5284EA.17FA70A7@online.no>
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David Fontaine wrote:
>
> ...
> Cool, iridescent! (er, photoelastic!)
Thanks !
Regards from Tor Olav
(who's running to his encyclopaedia to look up "iridescent")
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html
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From: Tor Olav Kristensen
Subject: Re: Since there no longer is a off-topic group ...
Date: 2 Jan 2001 20:55:16
Message: <3A528654.CD0AB098@online.no>
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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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From: Tor Olav Kristensen
Subject: Re: Since there no longer is a off-topic group ...
Date: 2 Jan 2001 20:58:02
Message: <3A5286FB.DD992020@online.no>
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Mick Hazelgrove wrote:
>
> I remember using polarised images of crystals when we did "light shows" in
> the seventies. They have always fascinated me.
In discotheques ?
You say that you used images of crystals,
but wouldn't it be possible to use the crystals themselves ?
Its a pity that I don't have any crystals at hand to play with.
Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html
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From: Tor Olav Kristensen
Subject: Re: Since there no longer is a off-topic group ...
Date: 2 Jan 2001 20:59:03
Message: <3A528738.C90E2313@online.no>
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Ken wrote:
>
> Tor Olav Kristensen wrote:
> >
> > ... I take the chance to mention here...
>
> There is nothing wrong with your action...
OK.
> > I find these optical properties very fascinating.
>
> As do I. Well done !
Thank you.
Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html
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