Dual film picture viewer

Claim 1

In a dual film motion picture viewer for projecting on a self contained viewing screen the images of a first series of photographic pictures formed on a first continuous photographic film moving along a path, the first film having a first film advance distance, a first film rest point and a first film advance opening position spaced a first distance from the center line of said path and for projecting the images of a second series of photographic pictures formed on a second continuous photographic film moving along said path, the second film having a second film advance distance, a second film rest point and a second film advance opening position spaced a second distance from the center line of said path the improvement which comprises: a. a film along said path advance lever for advancing the film, the lever having a claw end and a pivot end, b. a film advance lever cam for causing the claw end of the film advance lever to advance a distance and stop at a rest point; and, c. a film advance lever pivot for positioning the pivot end of the film advance lever a slide positioned in said viewer, the pivot being moveably mounted in said slide, the slide being so located that when the pivot is in a first position in the slide the claw end of the lever will lie in the first film opening position and by the action of the cam the claw will advance the distance of the first film advance distance and will rest at the first rest point and when the pivot is in a second position in the slide the claw end of the lever will lie in the second film opening position and by the action of the cam the claw end of the lever will advance the distance of the second film advance distance and will rest at the second rest point.