History
How did a stereograph make a photograph seem three-dimensional?
A stereograph pairs two slightly different views that merge into a depth effect through a stereoscope.
The Library of Congress describes stereographs as two nearly identical photographs or printed images mounted side by side. Viewed through a stereoscope, each eye sees one view and the brain combines them as a three-dimensional scene. The format was popular between the 1870s and 1920s.
Publishers sold views of places, events
Publishers sold views of places, events, industries and portraits in sets. Families collected them for entertainment and education, and captions on the mount recorded publisher and subject information.
Evidence: Collection research
A stereograph and a booth strip both present multiple images
A stereograph and a booth strip both present multiple images, but they use difference in distinct ways. The stereo pair builds depth from two viewpoints; a strip shows change across time from a fixed camera.
Evidence: Collection research · Encyclopedia; discovery and cross-check only
When reading a multi-image artifact
When reading a multi-image artifact, ask whether the frames represent a sequence, a pair of viewpoints or copies of one exposure. The pair is meant to be viewed together through a stereoscope, which directs a slightly different image to each eye. A loose single view loses the effect and may be hard to identify without its partner or caption. This object rewards attention to arrangement: two frames can encode depth rather than a sequence of poses.
Sources & further reading
Sources for the specific facts and product descriptions above. Our worked examples, interpretations and practical suggestions are original editorial guidance.
- Library of Congress — Stereograph cardsCollection research
- Wikipedia — StereoscopyEncyclopedia; discovery and cross-check only