Method of making a contact screen, and a method of making a screened positive for the preparation of printing plates or the like

Claim 1

A METHOD OF MAKING A MASTER FOR A CONTRACT SCREEN OF A CHARACTER PERMITTING THE DIRECT FORMATION OF A SCREENED POSITIVE FILM OR PLATE WITHOUT NECESSITATING THE USE OF A CAMERA, COMPRISING DISPOSIING A GRAVURE LINED SCREEN BETWEEN THE EMULSION SIDE OF AN UNEXPOSED FILM AND AN ARTIFICIAL LIGHT SOURCE, SAID GRAVUE LINED SCREEN HAVING OPAQUE HORIZONTALLY SPACED AND VERTICALLY SPACED LINES CROSSING EACH OTHER AT 90* TO FORM SQUARES OR CELLS, PLACING A PIN-HOLE SCREEN HAVING ONLY ONE PIN-HOLE APERTURE FOR EACH CELL THE AREA OF WHICH IS SUBSTANTIALLY LESS THAN THE AREA OF SAID CELL BETWEEN AND IN SPACED RELATION TO BOTH SAID LIGHT SOURCE AND SAID GRAVURE LINED SCREEN, ARRANGING SAID SCREENS WITH EACH PIN-HOLE APERTURE OF THE SECOND MENTIONED SCREEN IN ALIGNMENT WITH THE CORRESPONDING CELL OF THE GRAVURE LINED SCREEN, PASSING LIGHT DIRECTLY FROM SAID SOURCE THROUGH SAID SCREENS AND EXPOSING THE FILM, THE FILM UPON DEVELOPMENT POSSESSION WHITE SCREEN LINES CONSTITUTING THE IMAGE OF THE GRAVURE LINED SCREEN AND EACH SQUARE OR CELL BEING GRADUATED IN DENSITY FROM ITS CENTER WHICH HAS A DARK CORE AND DIMINISHES IN DENSITY UNIFORMLY IN TONE OUTWARDLY TO SAID WHITE LINES.

Claim 2

A METHOD OF MAKING A MASTER FOR A CONTRACT SCREEN OF A CHARACTER PERMITTING THE DIRECT FORMATION OF A SCREENED POSITIVE FILM OR PLATE WITHOUT NECESSITATING THE USE OF A CAMERA, COMPRISING DISPOSIING A GRAVURE LINED SCREEN BETWEEN THE EMULSION SIDE OF AN UNEXPOSED FILM AND AN ARTIFICIAL LIGHT SOURCE, SAID GRAVUE LINED SCREEN HAVING OPAQUE HORIZONTALLY SPACED AND VERTICALLY SPACED LINES CROSSING EACH OTHER AT 90* TO FORM SQUARES OR CELLS, PLACING A PIN-HOLE SCREEN HAVING ONLY ONE PIN-HOLE APERTURE FOR EACH CELL THE AREA OF WHICH IS SUBSTANTIALLY LESS THAN THE AREA OF SAID CELL BETWEEN AND IN SPACED RELATION TO BOTH SAID LIGHT SOURCE AND SAID GRAVURE LINED SCREEN, ARRANGING SAID SCREENS WITH EACH PIN-HOLE APERTURE OF THE SECOND MENTIONED SCREEN IN ALIGNMENT WITH THE CORRESPONDING CELL OF THE GRAVURE LINED SCREEN, PASSING LIGHT DIRECTLY FROM SAID SOURCE THROUGH SAID SCREENS AND EXPOSING THE FILM, THE FILM UPON DEVELOPMENT POSSESSION WHITE SCREEN LINES CONSTITUTING THE IMAGE OF THE GRAVURE LINED SCREEN AND EACH SQUARE OR CELL BEING GRADUATED IN DENSITY FROM ITS CENTER WHICH HAS A DARK CORE AND DIMINISHES IN DENSITY UNIFORMLY IN TONE OUTWARDLY TO SAID WHITE LINES.