Historical Echoes: Move Over Oculus Rift and Google Cardboard, Let’s Pay Homage to the — Stereoscopic Viewer!
Within the New York Public Library Digital Collections is the Robert N. Dennis Collection of Stereoscopic Views. Stereoscopic photographs were viewed with a stereoscopic viewer or stereoscope. According to the “About” tab of the NYPL page for the collection, “During the period between the 1850s and the 1910s, stereos were a mainstay of home entertainment, perhaps second only to reading as a personal leisure activity.” They also functioned as a way for people to travel vicariously, or as an aid to the study of history and other cultures. You know you’ve found an image meant to be seen with a stereoscopic viewer when it is double, with the images slightly askew from one another. The kinds of images that were particularly suitable as subjects for stereoscopic photography were those involving objects at varying distances from the viewer (for example, landscapes and cityscapes). (This is only one form of stereoscopy, which incorporates other technologies.)