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A slide viewer is usually a small handheld device with a slot in which a slide can be inserted to see a magnified illuminated view of it. A slide viewer is an instrument for individual viewing. Some models have an automatic feeder for inserting multiple slides and some have a slot for a strip of film.
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. Most devices were manufactured in France, but also in Germany by ICA and Ernemann. The glass slides are placed in a bakelite or wooden tray.
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.
Stereo Realist Red Button viewer with slides. The Realist uses standard 135 film.The unusual proportions of the slides (the image was 5 sprockets wide [5]) became the standard for 3-D slides, and is known as "5P" or "Realist Format".
A slide show in Germany. A slide show, or slideshow, is a presentation of a series of still images on a projection screen or electronic display device, typically in a prearranged sequence. The changes may be automatic and at regular intervals or they may be manually controlled by a presenter or the viewer.
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.