A fairly simple, yet efficient way to view stereoscopic images - even large format ones - is the so-called "Pigeon System".
On November 16th, 1904, Léon Pigeon (a professor at the University of Dijon, France), applied for a patent to protect his invention. So how does his system work?
Unlike Wheatsone's mirror-stereoscope, which used two mirrors, Pigeon's invention only needs one mirror. And therefore, only one of the images forming a stereo-pair (the one viewed through the mirror) has to be printed reversed or "mirror-inverted".
The drawing on the left illustrates the basic principle: the observer views one image directly (in this case the right-eye view), the other one through a small mirror (in the example the left eye view).
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