MARK THOMAS / SCIENCE PHOTO LIBRARY MARK THOMAS / SCIENCE PHOTO LIBRARY
Historical stereoscope. Wooden lenticular stereoscope with a selection of viewing cards next to it. Stereoscopes use two lenses (centre left) to superimpose two images on top of one another. This gives a 3D image when viewed through the lenses. Photographed at the Royal College of Ophthalmologists, London, UK.
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