Someone discovers Pulfrich!

[Marvin Jones <72657.3276@xxxxxxxxxxxxxx>]

> The 3D effects are very good.  The
>amazing thing (to me, anyway) is that there is little or no ghosting even
>WITHOUT THE GLASSES!  The glasses are some kind of polarized setup except one
>side is clear and the other is very dark.

You are describing Pulfrich 3D. It has been discussed here at length, and you
can probably search for extensive article on the website. But in brief, the
glasses are NOT polarized--there is simply one dark lens and one light one.
There is no ghosting because the picture is a normal television image. The dark
lens causes one eye to "lag behind" the other slightly so the brain is actually
receiving two different frames of the TV image simultaneously, one from each
eye. Thus whenever the camera moves in the proper direction the brain sees two
DIFFERENT frames as the same image, and since the lateral motion creates
parallax, the brain fuses a 3D image from them. It only works while the scene is
moving horizontally, and only in one direction; thus it is very limited in use.


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