stereoscopic daguerreotype

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1855 John Stull Stereo Viewer Double Dag Daguerreotype Quarter Plate

A stereoscope is a device for viewing a stereoscopic pair of separate images, depicting left-eye and right-eye views of the same scene, as a single three-dimensional image.

Two separate images are printed side-by-side. When viewed without a stereoscopic viewer the user is required to force his eyes either to cross, or to diverge, so that the two images appear to be three. Then as each eye sees a different image, the effect of depth is achieved in the central image of the three.

Embossed United States of America, Patented by John Stull Feb. 27, 1855. Orders furnished to any part of the United States or in Europe by the patentee S.W. Corner 6th 8 Chestnut St. Philadelphia, PA, green cover with gold embossing, Item is complete and comes with a rare stereo dag of a beautiful young girl in period clothes

http://www.ebay.com/itm/Antique-1855-John-Stull-Stereo-Viewer-Double-Dag-Daguerreotype-Quarter-Plate-/201112548241?pt=Art_Photo_Images&hash=item2ed33df391

http://en.wikipedia.org/wiki/Stereoscope