Photo of Employees at Work in a Small Stereoview Card Manufacturing Workshop (1860's)

Photo of workers in what looks like a small-time stereoview card manufacturing operation, probably French, c. 1860s. The two people sitting at the table at right appear to be cutting out and gluing albumen prints to cardstock with a bowl of glue in front of the woman and a sample stereoview sheet visible in front of the man. The man at left with wooden boxes is probably getting ready to start (or recently finished) printing some albumen prints from glass negatives affixed to the boxes outside or else in a well-lit room. Originally published as a stereoview.

Source: Library of Congress.

Stereoview Scene of a Man Looking at Stereoviews And a Wary Couple Titled “An Optical Delusion. - Things Seen And Things Not Seen.” (1850′s/1860′s)

Stereoview scene of a man looking at stereoviews and a wary couple titled “An optical delusion. - Things seen and things not seen.” Probably British, c. 1850′s/1860′s.

Source: Metropolitan Museum of Art.

Portrait of Union Soldier John Rodgers Meigs Showing Stereoviews to an Unidentified Woman Shortly After His Return From the First Battle of Bull Run (1861)

Portrait of Union soldier John Rodgers Meigs showing stereoviews to an unidentified woman shortly after his return from the First Battle of Bull Run, 1861.

Source.

Hand-colored Scene of Alexis Gaudin and His Family Looking at Stereoviews With Stereoviewers (1860)

Hand-colored and regular scene of Alexis Gaudin and his family looking at stereoviews with stereoviewers, c. 1860. Animated stereoview.

Source 1.
Source 2.