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Stereographs (also called stereo
cards, stereo- views, or stereotypes) are 3-D images that were introduced in the
mid-nineteenth century solely for entertainment purposes. These images, along
with the introduction of a stereoscope viewer invented by Sir Charles Brewster,
were presented to the public at the Crystal Palace exhibition of 1851. The
earliest stereographs were either produced by one camera taking two nearly
identical pictures about two inches apart, or by two cameras placed side by
side. The photographs were developed on separate plates. Soon the process was
perfected where both images could not only be taken with a single camera but on
a single plate as well.
These images can be viewed in 3-D
if you have "3-D glasses."
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