Photographic method for producing boundary lines

Claim 1

A PROCESS FOR REPRODUCING DESIGNS BY A PHOTOGRAPHIC PROCESS, IN WHICH THE DESIGN IS PLACED OVER A LIGHT SENSITIVE SURFACE WITH A LAYER OF TRANSPARENT MATERIAL INTERPOSED, AND AN EXPOSURE IS MADE FOR A SHORT PERIOD OF TIME TO DIFFUSED LIGHT WHICH CUTS IN BEHIND THE EDGES OF THE DESIGN ON THE LIGHT SENSITIVE SURFACE, THE DESIGN AND LIGHT SENSITIVE SURFACE BEING THEN EXPOSED FOR A LONGER PERIOD OF TIME TO A UNIDIRECTIONAL CONCENTRATED BEAM OF LIGHT WHICH CASTS A SHARP SHADOW OF THE EDGES OF THE DESIGN ON THE LIGHT SENSITIVE SURFACE, THE LIGHT SENSITIVE SURFACE BEING THEN DEVELOPED AND DRIED BUT NOT FIXED, A FURTHER EXPOSURE BEING MADE OF THE LIGHT SENSITIVE SURFACE TO A BEAM OF LIGHT THROUGH A SCREEN BUT WITHOUT THE DESIGN THEREON, AND THEN THE LIGHT SENSITIVE SURFACE IS DEVELOPED AND FIXED, AND SUBJECTED TO A REDUCING PROCESS WHICH CLEARS THE INCOMPLETELY EXPOSED AREAS WHERE THE DIFFUSED LIGHT HAS CUT IN BEHIND THE EDGES OF THE DESIGN, WHEREBY BOUNDARY LINES ARE OBTAINED ROUND THE OBJECTS CONSTITUTING THE DESIGN AND FINE LINES IN THE ORIGINAL DESIGN ARE SATISFACTORILY REPRODUCED.