Le Polyphote is a com­pact mul­ti-view tray stere­o­scope designed to work with slide trays for 25 slides each, notably com­pat­i­ble with the famous Tax­iphote trays by Jules Richard. The device oper­ates by turn­ing a key-shaped knob: turn­ing it coun­ter­clock­wise lifts a glass slide into posi­tion in front of the lens­es, while turn­ing it clock­wise returns the slide and advances the tray to the next one. A side but­ton allows users to nav­i­gate direct­ly to a spe­cif­ic slide, while a small fold-out mir­ror helps read the slide num­ber on the tray. The stere­o­scope includes a stor­age base for an addi­tion­al slide tray. 

Fur­ther read­ing: Stere­oscopy His­to­ry Series — Lucien Bize (A. Ruiter)