Graphoscope ‘Modèle de luxe, Jumelle et Chambre’, Luxe

Jean-Bap­tiste Fou­quet designed an improved ver­sion of the Eng­lish Grapho­scope. The Eng­lish Grapho­scope fit­ted with stereo lens­es is orig­i­nal­ly an open view­er. Fou­quet added a wood­en box with a stere­oview hold­er behind the stereo lens­es, turn­ing it into a closed sys­tem for view­ing stereoviews.
(from: Com­pendi­um of Stereoscopes)