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Cadwell Revolving Stereoscope, with interior label showing patent date of January 6th 1874.
Stereographica - Antique Photographica
Courtesy of Bryan and Page Ginns (#14 / 23)
Designed to hold 100 stereo views back to back to be viewed from both sides. Measures 9 " x 11" at the base x 10.5" high. Refer Wing page 126 for information and an illustration of a similar viewer.