Of all the forms of early photography, the stereograph was the most popular and successful. Stereographs consist of two nearly identical photographs or photomechanical prints, paired to produce the illusion of a single three-dimensional image, usually when viewed through a stereoscope.
Typically, the images are on card mounts, but they may take the form of daguerreotypes, glass negatives, or other processes. Stereographs were first made in the 1850s and are still made today. They were most popular between 1870 and 1920.
Stereograph of Graf Zeppelin over pyramids in Egypt
Stereographs are usually mounted. They were typically published with caption information printed under the image or on the back of the mount. The mount also provided information about the publisher, photographer, and sometimes the series or a list of views available from the photographer or publisher. Throughout the mid to late 1800s, countless images were made for every possible subject. Stereographs were so popular that it was said that every home had a stereoscope.