Stenograph image had existed since the early days of photography. Its a technique in which a camera takes two pictures at the time from a slightly different point of view. Stereoscopic or 3-D imaging creates the illusion of three-dimensional depth from images on a two-dimensional plane. It was no widely produced until the early 1850's. Stenographs reach the height of their popularity in the 1870's and were a common diversion in fashionable Victorian parlors. Landscapes were also a popular subject, because of their unique three-dimensionality, perhaps most effectives in scenes that rendered perspective.
While we increasingly think of 3-D as a modern technology to be found in the cinema, it’s worth noting that this type of photography exists since a hundred fifty years ago.
For viewing stereoscopic images:
Seeing them stereoscopically requires concentration and may take a while to master.
In order to gain the depth impression, the simplest method is, to squint or look cross-eyed at the image. For this to work, place yourself in front of a stereoscopic pair suited for cross-eyed viewing. You need to look at the left-hand image with your right eye, and at the right-hand image with your left eye so that the two images in the center come together. When you are viewing correctly, you see three images instead of four. The center image is three-dimensional. Usually, even before you begin to get the hang of focusing, the two central images lock together, because your mind begins to interpret them as a single 3D object.
REF: UNK11HNBP04
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