Brewster Stereoscope, Burl Walnut, Short Focus, Prismatic Lenses

Paul Émile Chap­puis, who was born in France, moved to Lon­don to estab­lish a pho­to­graph­ic stu­dio. In 1857, he intro­duced a mir­ror in the hinged lid of the stere­o­scope, allow­ing reflect­ed light to be direct­ed into the view­er. This elim­i­nat­ed the need to tilt the stere­o­scope towards a light source in order to illu­mi­nate the image. In 1858, Chap­puis intro­duced the first tis­sue stereoview.
(from: Com­pendi­um of Stereoscopes)