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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 ?
Like the 1877 panorama of San Francisco, one of Muybridge's stereopanoramas of the Modoc lava beds repeats details at the edges of successive views, such that the curving boundary of Tule Lake appears both at the right edge of the first stereograph and then again, as a fragment, at the left edge of the second stereograph.
Stereographs of "New Women" were bought and sold from shop
To make photographically illustrated books as cheaply as stereograph cards required that images be reproduced simultaneously with the text-not made separately and pasted in as with The Yosemite Book.
The Oberhausen program contained only oblique gestures to this history of "useful" 3-D: Scott Stark's Speechless (2008) repurposed medical stereographs, taken from a 1976 textbook titled The Clitoris, of vulvae in extreme close-up; Johann Lurf's Embargo (2014) surveilled the Austrian weapons industry in relief; and, much less self-consciously, Philippe Baylaucq's Ora (2011) aestheticized technology used for killing by capturing half-naked dancers with a restricted form of HD thermal imaging developed for the US military by Lockheed Martin.
Civil War photographers exhibited their photographs, published them in books and newspapers, and sold prints and stereographs. Commercial motives certainly fueled the proliferation of photography, but there was also a desire to commemorate the event.
Ten archival stereographs from the Library of Congress in Washington and the Fouad Debbas Collection, showing street scenes taken in Beirut in the early 20th century, have been matched to the exact spot they were taken a century ago.
'' I look upon photography being a most valuable aid education pictorial is by far the mode and manner of instruction Seven years after his death the trustees of his estate presented to Birmingham Reference Library his collection of 22,000 photographs, 600 stereographs, 2500 lantern slides, 17,000 glass negatives, 50 albums of collected prints, and 50 volumes of press cuttings relating to his work.
Census data with old phone books ("Direct Me NYC: 1940"), to transform more than 40,000 historical stereographs into web-friendly 3D formats ("The Stereogranimator"), and to digitally align/rectify historical maps with present day locations ("Map Warper").
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.
(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).
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.
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.