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The Keystone View Company was a major distributor of stereographic images, and was located in Meadville, Pennsylvania.From 1892 through 1963 Keystone produced and distributed both educational and comic/sentimental stereoviews, and stereoscopes.
At one time, Underwood & Underwood was the largest publisher of stereoviews (also known as stereographs or stereoscopic cards), in the world, producing 10 million views a year. The Underwood brothers developed a selling system of thorough canvassing using college students.
The belt can usually hold 50 paper card or glass stereoviews, but there are also large floor standing models for 100 or 200 views. A more advanced multiple view stereoscope is only intended for glass slides and was especially popular in France, as the printing of stereo images on glass was a French specialty and popular until the 1930s.
The View-Master was marketed through Mayer's photo-finishing, postcard and greeting card company Sawyer's Service, Inc., known eventually as Sawyer's, Inc. The partnership led to the retail sales of View-Master viewers and reels. The patent for the viewing device was issued in 1940, and this original model came to be called the Model A viewer.
James Beckett was a statistics professor before launching Beckett Media. [3] In the 1970s, Beckett introduced some of the initial price guides for the baseball card industry, providing more detailed information on specific card prices compared to the newsletters that collectors were accustomed to. [4]
Stereoscopy creates the impression of three-dimensional depth from a pair of two-dimensional images. [5] Human vision, including the perception of depth, is a complex process, which only begins with the acquisition of visual information taken in through the eyes; much processing ensues within the brain, as it strives to make sense of the raw information.
Tru-Vue Chicagoland model 3D viewer with package and black&white films A Tru-Vue viewer and film cards from 1953, by which time the company had relocated to Oregon and become a subsidiary of Sawyer's.
The exact number of series released is unknown, though it is known to be in excess of 300 10-card sets over the 5-year lifespan of the company. [ 5 ] One of the rarest sets was that of the Irving Theatre in London, where Stanley Long was the in-house photographer.