This three-colour projector is asociated with the cinematography pioneers F Marshall Lee and Edward Turner. Three consecutive frames of the film are projected simultaneously by means of three projection lenses placed close together. Each frame of the film is projected three times, first through the upper lens, then the middle lens, and finally the lower lens. The colour is provided by a synchronised rotating three-sectored shutter bearing concentric bands of colour filters.
© National Museum of Science & Media / Science & Society Picture Library