A paired photo image mounted on a horizontal card When viewed through a stereoscope, a three dimensional image is seen Stereographs were popular from the 1860's through the 1920's and include many political views
A cardboard mount holding two photographs of the same subject, each from a slightly different point of view When viewed with binocular vision, a stereoscopic effects of three-dimensional depth of fields is achieved
> The general term given to include all types of stereo images: stereocards, stereo-daguerreotypes, stereo-ambrotypes and stereo-(dia)positives (stereo pairs on glass)
{i} photograph which appears three-dimensional when viewed through a stereoscope or special glasses