[Jewelry making - Article 00282] - Re: [Orchid] Ruby Vs. Garnet

[Steve . Mashburn]

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Ring14k,

    I believe your post could be confusing to the uninitiated concerning
    polarized light. Let me try: When two polarized filters are oriented
    properly, and arranged one in front of the other so that you look
    through both of them , they can show the effects of polarized light
    on an object that is located between the two filters. 

    How do you orient them properly?  well, if they are from the same
    stock, then hold one steady in one hand, in front of a light source. 
    Take the second filter, and hold it in line with the first so that
    you look through them both. Rotate the second filter in the same
    manner as a second hand on a clock rotates, while holding the first
    one steady.  You will see, at some point, the most amount of light
    transmission, and then, approximately ninety degrees from that point
    you will see the minimum amount of light transmission. 

    At this point of minimum transmission, use your third hand to place
    the object to test between the filters.  If it shifts the
    polarization of the light, it will appear as a bright spot. Oh, it
    would probably be best to use a non polarized light source for
    viewing, such as regular incandescent light. 

    I have some scraps of this (polarizing film) material that i would
    donate for experimentation if you contact me off-line. 

steve


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