Jahnholtz system stereo viewer made by Richard
Very rare Jahnholtz system stereo viewer made by Richard.
The mechanism is operated by a handle underneath, which allows the views in the upper part of the viewer to be advance one at a time.
Very few examples are known in private collections.
See: Paul Wing, "Stereoscopes, the first one hundred years", page 182.
Stéréoscope système Jahnholtz constructeur Richard.