Stereographic image. Original card stereograph from CFPL Photofile. Source undetermined. The original of this photograph of Bronson Alcott in his study comes from a card stereograph dating from the 1870s. Card stereographs (also known as stereo cards, stereotypes, or stereoviews) consist of paired photographs of the same image side-by-side on a card backing. (Images in this format were also produced on glass.) Viewed through a stereoscope, the two images appear as a single three-dimensional image. Stereo cards were mass-produced and eagerly collected in the nineteenth century, serving as a form of home entertainment and self-education. A number of repositories have extensive stereograph holdings, the Concord Free Public Library included.
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