Ph Projection Printing Rectifier

An instrument designed to make transformed prints of tilted, aerial photographic negatives. In operation, the negative is mounted on a frame and its image is projected through a lens system onto a sensitized material affixed to an easel. In order to achieve rectification, the angle of any two of the foregoing elements (negative frame, lens, easel) must be adjustable. It is used for photogrammetric purposes. Excludes printer, projection, photographic; and printer, transforming, photogrammetic.