Stereoscopic plotting apparatus

Claim 1

Stereoscopic plotting apparatus comprising film support means and two projector means including photograph supports mounted for relative movement of approach towards and separation away from one another and variation of distance to and from said film support means, the projectors being adapted to project images of corresponding zones of first and secOnd said photographs, of the same subject photographed from two distinct points to form a stereoscopic pair onto first and second sensitive films respectively when supported by the film support means, said projector means being adapted to locate the respective beams projecting the images of each zone of the subject in positions substantially homologous to the positions of the incident rays by which the photographs were originally taken; an exposure system for the photographic recording of the image resulting from the projection of one and then the other of the respective photographs, on to the two films when supported successively by the film support means, and displacement means arranged to move at least one of the photograph supports, said displacement means comprising first means sensitive to said variation of distance, second means for effecting said relative movement in a plane parallel to the plane of the film support means and in a direction homologous to that passing through said two distinct points, and coupling means coupling said second means to said first means so that the amount of said relative movement can be made dependent on said variation of distance from the film support means to the photograph supports, a decrease or increase in said distance corresponding to said approach or separation respectively of the photographs.