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Tutorial on Using a Polariscope
https://www.gemologyonline.com/Forum/phpBB2/viewtopic.php?f=37&t=15490
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Author:  Barbra Voltaire, FGG [ Fri Feb 24, 2012 12:46 am ]
Post subject:  Tutorial on Using a Polariscope

This tutorial was compiled by Starla Turner, FGA, GG:

Author:  Osman khattak [ Fri Feb 24, 2012 2:24 pm ]
Post subject:  Re: Tutorial on Using a Polariscope

very nice informative video, thanks for sharing

Author:  kylochua [ Mon Jun 25, 2012 10:12 am ]
Post subject:  Re: Tutorial on Using a Polariscope

This forum just keeps getting better and better.. (Thanks Barbra) :wink:

Author:  Barbra Voltaire, FGG [ Mon Jun 25, 2012 10:40 am ]
Post subject:  Re: Tutorial on Using a Polariscope

Oh Starla is just the coolest.....if you ever get an opportunity to take a class from her, jump on it.

Author:  Rachling [ Fri Apr 08, 2016 11:23 pm ]
Post subject:  Re: Tutorial on Using a Polariscope

kylochua wrote:
This forum just keeps getting better and better.. (Thanks Barbra) :wink:


Yes, I agree. Thanks for sharing the videos. I've been watching the other videos of her and they're very helpful. I'm totally new at this but this really makes it much easier to follow. Thanks again. Any chance you can share more videos?

Author:  dchallener [ Sat Apr 09, 2016 8:22 pm ]
Post subject:  Re: Tutorial on Using a Polariscope

Just a bit of a correction. Light polarized at 45 degrees from the Polaroid filter will have a 50/50 chance of going thru - but after it goes through it will be polarized in the same direction as the filter. Light that is 90 degrees off has no chance of going through.
Going through the calculations, a perfect polarizing filter will let 1/2 of the light through. And strangely if you have 3 Polaroid filters, in this order: horiz, 45 degrees, vertical, light DOES get through. Half goes through the first filter and is polarized horizontally. Half of that makes it through the 45 degree filter, and half of that goes through the vertical filter, so 1/8 of the original light goes through. But if you remove the middle filter, NO light gets through.

Strange games with Polaroid filters.

Author:  Kyrylo Gubariev [ Wed May 01, 2019 1:06 am ]
Post subject:  Re: Tutorial on Using a Polariscope

Hello again! Here is an updated Polariscope Tutorial, hope it would be helpful for some forum members :)
Direct link:

https://youtu.be/yU4TBIiYVfA


Best Regards, Kyrylo Gubariev.

Author:  Barbra Voltaire, FGG [ Wed May 01, 2019 10:41 am ]
Post subject:  Re: Tutorial on Using a Polariscope

=D> =D> =D> Well done!

Author:  Gabroo [ Thu May 02, 2019 3:37 am ]
Post subject:  Re: Tutorial on Using a Polariscope

Nice videos,

Author:  adamsc [ Thu Nov 14, 2019 12:44 am ]
Post subject:  Re: Tutorial on Using a Polariscope

Thanks that was really informative, The video tutorial helped me to finally understand about polariscope. I was looking for more information on interference figures and It makes me happy.

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