Large, foldable Graphoscope, Luxe
Henry J. Lewis was a son of William Lewis, a pioneering photographer and supplier of daguerreian materials in New York. Henry Lewis patented a design that was a variant of the English Graphoscope.
The device has a large lens for conventional photographs and two stereo lenses. All three lenses are mounted in a single panel, and the large lens cannot be folded away, as is often the case in the English Graphoscope. The device folds up completely into a relatively compact box. The baseboard is mounted on a movable system of struts that allows the viewer to be directed. In a later version, the struts were replaced by a simpler mechanism.
(from: Compendium of Stereoscopes)
