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Spiro, Lisa. "A Brief History of Stereographs and Stereoscopes." //CONNEXIONS//. 30 Oct. 2006. Web. 17 Sep. 2010. <[]>.

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 * "Stereographs (also know as stereograms, stereoviews and stereocards) present three-dimensional (3D) views of their subjects, enabling armchair tourists to have a “you are there” experience."
 * "The term “stereo” is derived from the Greek word for “solid,” so a “stereograph” is a picture that depicts its subject so that it appears solid."
 * "Stereographs feature two photographs or printed images positioned side by side about two and half inches apart, one for the left eye and one for the right. When a viewer uses a stereoscope, a device for viewing stereographs, these two flat images are combined into a single image that gives the illusion of depth."
 * "Since our two eyes are positioned about two inches apart, we see everything from two slightly different angles, which our brain then processes into a single picture that has spatial depth and dimension."
 * "In 1838, Charles Wheatstone published a paper that provided the scientific basis for stereography, showing that the brain unifies the slightly different two-dimensional images from each eye into a single object of three dimensions."
 * "In 1850 Sir William Brewster invented an inexpensive viewing device for stereographs called the lenticular stereoscope. This device is a closed box that has one or two openings for light; two lenses are located on the top and enable the viewer to see a three-D image on the floor of the box."
 * "Businesses such as the London Stereoscopic Company quickly developed technologies for mass-producing stereographs; indeed, between 1854 and 1856 the company sold over half a million stereographs."
 * "In America, doctor and writer Oliver Wendell Holmes helped to popularize stereographs by inventing a hand viewer and promoting the creation of stereograph libraries."
 * "Ultimately stereoscopes ranged from small, inexpensive hand-held devices to large pieces of furniture that could display a changing series of up to 100 stereographs."
 * "Early stereographs measured approximately 3 1/2 x 7 inches, but during the 1870s larger sizes emerged, including the 4 x 7 inch “cabinet,” the 4 ½ x 7 inch “deluxe,” and the 5 x 7 inch “imperial” cards. By the late 1850s, the standard thickness of cards was .04 inches."
 * "Curved mounts became prominent in the 1880s, after B. W. Killburn found that a mount with a slight curvature could increase the illusion of depth."
 * "Between the 1840s and the 1920s, stereographs served as an important method of entertainment, education, and virtual travel—predecessors to contemporary forms of media such as television and movies."
 * "As Burke Long argues, 'Mass-produced and relatively cheap, the integrated system of mechanical viewer and photographs became fashionable for classroom pedagogy, tourist mementos, and parlor travel to exotic places of the world.'"
 * "People viewed stereographs at homes, schools, and churches, gazing at images documenting almost every subject imaginable from astronomy to zoology."
 * "According to stereograph collector and historian William Darrah, stereographs were used to teach millions of American children about geography, natural history, and a range of other subejcts."
 * "A few contemporary artists use stereography as an expressive medium, while people now don stereoscopic glasses (and data gloves) to explore computer-generated 3D virtual reality environments."