A bit of polarizer info in 3D History

[P3D Michael Kersenbrock <michaelk@xxxxxxxxxxx>]

Greetings,

        A portion of some private email I had sent was quoted
to the whole group recently.  Part of quote missing was
that I was going to look up that which I had recalled off-hand.
I have done so, and below is the result.

        It seems that man-made polarizers (although not mass
produced and inexpensive) existed long before the Genius of
Dr. Land, and was used for stereo projection.  It seems that
such existed more than a Century ago.

        Below is the reference I found.  It's quite interesting.


Mike K.

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STEREOSCOPE FOR POLARISED LIGHT

This stereoscope was invented by Mr. John Anderson.

Two lanterns LL' project, as before, the two superposed pictures on one
screen. Before each lantern a polariser PP' is introduced at a distance of
90 degrees apart (in Mr. Anderson's apparatus these polarisers are made
of blocks of glass).

The picture received by the screen and appearing single, is thus formed
of two polarised

        [Figure 62  of a basic stereo-projection setup was here  -Mike]

pictures, for instance one in a vertical, and the other in a horizontal
postion.

If an observer look at this picture through two analyzers a a' placed
before his eyes O O' and conveniently fixed, each eye will see a
different picture in perfect stereoscopic relief.

The analyser is formed of two nicols prisms mounted in a sort of
opera-glass.  Naturally, if the nicols be 90 degreees from their normal
position, the right eye will see the left picture, and the left eye the
right picture, in such a way that pseudoscopic relief will be produced.

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Above is a quote from the book:

        "The Stereoscope and Stereoscopic Photography"

                by F. Drouin

        Originally published in French in 1894

        First English printing was also in 1894
        

I'd encourage anyone who has not purchased a copy from Reel-3D
to do so (assuming these reprints are still available... they haven't
sent me a new catalog) while one still can.  VERY interesting
book.  :-)


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