To load the device, the front pan­el is opened and a tray of 25 glass slides can be insert­ed. By turn­ing a side lever, one of the images is pushed upwards from the tray by two met­al fin­gers from below, allow­ing it to be viewed. …

The stere­o­scope car­ries the name Leroy, although the name­sake played no role in its devel­op­ment. The man­u­fac­tur­er of the stere­o­scope, Émile Guérin, con­tin­ued the com­pa­ny of Lucien Leroy and retained the estab­lished name Leroy as a brand. The Stéréo-Classeur Leroy is a com­pact stere­o­scope with a …

Four bake­lite trays con­tain­ing 25 glass slides each can be insert­ed through a flap on the left side of the view­er. These trays are bent by 90 degrees and are arranged to form a drum. Then, by mov­ing a small knob, locat­ed on the right …

Le Stéréo­drome is a robust stere­o­scope with a heavy-duty and reli­able con­struc­tion. The device exhibits a sta­ble design that remained in pro­duc­tion into the 1930s with­out sig­nif­i­cant mod­i­fi­ca­tions. The mod­el designed to accom­mo­date a pro­jec­tion lamp has a few vis­i­ble dif­fer­ences on the out­side and …