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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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From: Tor Olav Kristensen
Subject: Re: Since there no longer is a off-topic group ...
Date: 2 Jan 2001 21:06:08
Message: <3A5288E0.4546F4DE@online.no>
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Dearmad wrote:
>
> The inside of paprika? Dear man, but my god! The codliver oil I can
> undestand, however Paprika is taking it just too far!
Sorry. It was a just "a momentary lapse of reason".
Regards from Tor Olav
(who still think it would be nice to be inside
a red paprika with strong light outside. =)
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html
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In article <3A5284EA.17FA70A7@online.no>, Tor Olav Kristensen
<tor### [at] onlineno> wrote:
> (who's running to his encyclopaedia to look up "iridescent")
finish {
irid {AMOUNT
thickness FLOAT
turbulence TURBULENCE
}
}
:-)
--
Christopher James Huff
Personal: chr### [at] maccom, http://homepage.mac.com/chrishuff/
TAG: chr### [at] tagpovrayorg, http://tag.povray.org/
<><
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From: ingo
Subject: Re: Since there no longer is a off-topic group ... - 1 attachments
Date: 3 Jan 2001 00:46:59
Message: <Xns901E43265seed7@povray.org>
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in <3A528654.CD0AB098@online.no> Tor Olav Kristensen wrote:
>
>Very clear illustrations of the phenomena,
>but what is a 1/4 lambda plate ?
>
A quarter wave plate is made out of a birefringed material (thin plates of
mica). A birefringed material makes light of orthogonal polarizations
traverse the material at different velocities. One wavefront will be ahead
of the other by a distance that depends on the thicknes of the material.
wave plate.
It is for example used to determine wether you have circular polarized
light or a combination of linear- and non-polarized light.
>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" ?
To start with the latter, "schliffs" are higly polished and very thin
slices of stone/mineral. If you make them thin enough you can look throug
every stone. In for example a granite there are several minerals, each
with its own optical properties. In polarized light each will show in a
different colour and density.
Attatched a micrograph of Asperine in polarized light. Cant find the
colour print :(
Ingo
--
Photography: http://members.home.nl/ingoogni/
Pov-Ray : http://members.home.nl/seed7/
Post a reply to this message
Attachments:
Download 'asperine.jpg' (7 KB)
Preview of image 'asperine.jpg'
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From: Tor Olav Kristensen
Subject: Re: Since there no longer is a off-topic group ... - 1 attachments
Date: 4 Jan 2001 19:57:24
Message: <3A551B97.91DEDA35@online.no>
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ingo wrote:
>
> in <3A528654.CD0AB098@online.no> Tor Olav Kristensen wrote:
> >
> >Very clear illustrations of the phenomena,
> >but what is a 1/4 lambda plate ?
> >
>
> A quarter wave plate is made out of a birefringed material (thin plates of
> mica). A birefringed material makes light of orthogonal polarizations
> traverse the material at different velocities. One wavefront will be ahead
> of the other by a distance that depends on the thicknes of the material.
> wave plate.
> It is for example used to determine wether you have circular polarized
> light or a combination of linear- and non-polarized light.
>
> >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" ?
>
> To start with the latter, "schliffs" are higly polished and very thin
> slices of stone/mineral. If you make them thin enough you can look throug
> every stone. In for example a granite there are several minerals, each
> with its own optical properties. In polarized light each will show in a
> different colour and density.
Thank you very much for explaining Ingo.
I wish I had such "stuff" to play with.
> Attatched a micrograph of Asperine in polarized light. Cant find the
> colour print :(
Nice - I would love to see such images in colours !
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: 4 Jan 2001 19:59:11
Message: <3A551C04.46391A83@online.no>
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Chris Huff wrote:
>
> In article <3A5284EA.17FA70A7@online.no>, Tor Olav Kristensen
> <tor### [at] onlineno> wrote:
>
> > (who's running to his encyclopaedia to look up "iridescent")
>
> finish {
> irid {AMOUNT
> thickness FLOAT
> turbulence TURBULENCE
> }
> }
>
> :-)
Ahh .... I'll try out this.
Thanks.
Tor Olav
--
mailto:tor### [at] hotmailcom
http://www.crosswinds.net/~tok/tokrays.html
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