The Holmes Stereoscope Stereoscopes are an old invention that allows photos to be viewed in 3-D. The first stereoscopes date to around 1838. They were very popular. There were various models available when Oliver Wendell Holmes invented the hand stereopticon,
The Holmes Stereoscope, Stereoscope Viewers & Cards
![The Holmes Stereoscope, Stereoscope Viewers & Cards The Holmes Stereoscope, Stereoscope Viewers & Cards](https://i0.wp.com/www.design42.com/caving/blog/wp-content/uploads/2016/12/featuredimage-1.jpg?resize=750%2C348&ssl=1)
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