Tray-Stereoscope ‘Planox Rotatif’

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 side, up and down, the drum slow­ly rotates and one slide after anoth­er can be exam­ined. The slides are pulled up by mag­nets which con­nect to met­al strips attached to the glass slides. On the right side of the view­er, a brass arrow will point to the num­ber of the cur­rent slide on a cir­cu­lar scale. A large knob in the cen­ter of the scale allows nav­i­ga­tion to a spe­cif­ic slide. For that, the knob has to be stopped at an inter­me­di­ate posi­tion, which unlocks the tray move­ment. This posi­tion is also required to exchange the trays.