A tray-type stereoscope is a multiple view stereoscope for glass stereoviews and autochromes. It uses trays of bakelite or wood to store the glass slides. Most types work as follows: the tray is placed into the stereoscope and by turing a crank or operating a lever, a slide is picked up from the tray by a mechanism and placed into viewing position. After a next action the slide is put back into the tray and the tray moves over a rail to select the next slide. Examples are the Taxiphote and Planox.
Some tray-type viewers use an alternative mechanism, like the Multiphote or Le Nain.