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a general-purpose stereophotogrammetric device for mechanical projection with transformed bundles of rays. Stereographs are used for making topographical maps from aerial photographs with angles of inclination up to 3°. The principle of the stereograph was proposed by the Soviet scientist F. V. Dro-byshev in the early 1950’s; the abbreviation for the device is SD (stereograph of Drobyshev).

Figure 1. Diagram of a stereograph

Figure 1 illustrates the principle of the stereograph. The aerial photographs (1) are always positioned horizontally regardless of their angles of inclination. The effect of the angles of inclination is compensated by correction mechanisms, consisting of the correction planes (2) along which the followers (3) move. The followers in turn displace the carriages (4) connected to the universal joints (5). Through these joints, the projecting arms (6) link the photographs to the coordinate measuring device equipped with guide bars (X, Y, and Z). A base device containing mechanisms for introducing the base components (bx, by, and bz), which constitute the base of the projection, is moved along by the carriage (Z). When the carriages of the coordinate measuring device move, the projecting arms, rotating around the centers of projection (7), simultaneously move the photographs and the followers along inclined (depending on the angles of inclination of the aerial photographs) correction planes. As a result of this movement, the position of the universal joints (5) undergoes a change, and the photographs receive additional displacements (the effect of the angles of inclination being eliminated).


References in periodicals archive ?
I thought maybe people should walk through Beirut in 1915, and the only way to do that is to place these stereographs in the street, where they were originally taken.
Building on the two images of a stereograph, Marcy photographed a bird in flight from three perspectives in an attempt "to photograph the wing's movement in three dimensions" (Braun, Picturing 136).
Her first chapter traces the public profile of organized labour as it developed in the decades before the rise of photojournalism in the 1930s, with special attention to visual representations of labourers transmitted through earlier technologies like engravings, stereographs, and halftones.
His glass-plate negatives and stereographs were copied to engravings and printed in Hutchings California Magazine, which was distributed throughout the United States, helping to make famous the wonders of the great valley.
18) Photographs of the canal were made into stereographs, which were a popular form of entertainment in affluent households, in addition to being published in newspapers and books about the canal (Missal 89-91).
Because of the Huntington's remarkable resources of prints, engravings, lithographs and photographs, this exhibition also possessed a robust visual dimension that included hand-coloured landscape views from the Pacific Railroad Surveys, stereographs by A.
The next chapter examines the travel narratives produced by numerous foreigners in Mexico during the course of the first decades of the nineteenth century, and explores how maps, texts, lithographs, daguerreotypes, and stereographs became of fundamental importance to the narratives of Mexican national character and identity.
These single-channel images reach the brain like stereographs in which we see the artist as both petty tyrant and impotent try-hard, the viewer at once a passive receptacle and an indispensable collaborator, and narrative as hopelessly contrived as it is inevitable.
9) Stereographs, which created the illusion of depth with the proper viewing equipment, could also be purchased and enjoyed at home.
This vast collection by one of Birmingham's most noted amateur photographers comprises some 22,000 mounted prints (albumen and platinum prints c1870-1914), 17,000 glass negatives, 600 stereographs, 50 albums of collected prints (largely carte de viste and cabinet format c1865-1880), 50 albums of cuttings relating to the photographer and his activities, Parliamentary Diaries, and Stone's original print and negative index.
Moreover, the 1925 standards clarified and broadened the teaching responsibilities of the librarian by mandating that they include an ever-expanding list of audiovisual items for collection development, including cards, pamphlets, newspaper/magazine clippings for vertical files, moving picture films, pictures, stereopticon slides, stereographs, and Victrola records (NEA & ALA 1925).
He may even have taken his inspiration for "A une passante" from the first exhibit of instantaneous stereographs in Paris early in 1860.