Seeing double again: more stereo viewers
As I have written before, stereoscopy and stereo-photography are part of a popular niche in photography and collecting. Some people, for example Ron Blum, of South Australia, have collected vast libraries of stereo images and are experts in the field. For myself, it's a peripheral interest, but that hasn't stopped me from accumulating a few hundred traditional stereoview cards and also a handful of different stereoscopes. One with particular resonance for me is the bright red plastic "View-a-Scope" issued by the Sanitarium food company in the 1960s to view a couple of series of stereo cards…