Transcription: In 1838, the English physicist Charles Whetstone developed the technology of stereo pictures and the stereoscope. Although three-dimensional vision had long been the subject of study, this was the first real foundation in the breakthrough of stereography. A stereo picture consists of two pictures or photographs that differ only marginally from each other. If one lays these side by side and looks at them through a special stereo viewfinder or even with a little practice without any technical aid there appears to the viewer a single spatially evoking picture.
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