Photocomposition apparatus for building up complex designs - has dummy apparatus for setting up design and identical light proof apparatus for exposing film to produce picture

摘要

The photocomposition apparatus allows a complex design to be built up on a photographic plate from simple elements stored on a negative film. The apparatus (1) consists of a light proof chamber (B) and a chamber open to the light (A). Identical negative films containing the design elements are placed (9, 10) in each of the two chambers. A dummy screen (17) allows the projection of the design elements through an objective lens (14) to be aligned as required by moving the trolley (7) on which the negatives sit, or the trolley on which the dummy screen (17) sits. Once alignment has been completed a shutter (16) is opened in the light proof box and the identical alignment of design elements is projected from the second negative (10) onto a photosensitive plate (18).