Holmes Stereoscope, 1850, PhotoMuse Collection, 2014, Gift of Dr. Unni Krishnan Pulikkal, Source – Herbert Ascherman Collection.
The stereoscope, which dates from the 1850s, consisted of two prismatic lenses and a wooden stand to hold the stereo card. This type of stereoscope remained in production for a century and there are still companies making them in limited production currently. A stereoscope is a device for viewing a stereoscopic pair of separate images,…