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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.
For the project, which was funded by the Heinrich Boll Foundation, Razan originally selected around 35 stereographs from the two collections.
Though these stereographs now appear to lead away from the main path of his experiments, they reveal how he interwove techniques of spatial and temporal juxtaposition.
A cross between a serial set of stereographic views and a linear, photographic panorama, stereopanoramas represented a spatially continuous scene as a series of stereographs.
Several were only recently discovered, nested within a larger 1873 series of stereographs Muybridge made documenting the Modoc Wars (Solnit, "Tangles" 184).
Viewing a series of stereographs as a panorama seems to undermine panoramic coherence, pulling the viewer in and out of multiple views rather than opening one overarching view.
The explicit visual continuity that stereopanoramas staged across stereographs compressed the temporal and spatial relationships that conventionally organized a set of stereo views as a "tour.
stereo images that when viewed through a stereograph viewer create a
Some were exhibited at the Goupil Gallery, and it seems likely that it was Watkins's stereographs that influenced Bierstadt and the popular writer and lecturer Fitz Hugh Ludlow to make the trip to Yosemite in 1863.
From stereographs to movies, from teaching machines to computers, throughout this century poor-quality programs, dull pictures, and unreliable software have disappointed teachers and led them to reject the new machines.
Stone bequeathed a vast archive to Birmingham libraries which includes 22,000 mounted prints dating from about 1870 to 1914, 17,000 glass negatives, 600 stereographs, 50 albums of collected prints (c1865-1880) and 50 albums of cuttings relating to his photographic activities.
Few middle-class homes of the era were without a stereograph set, and stereoview companies sprang up to meet the demand.