Intaglio printing screen for superimposing with autotypy screen positives in the production of etchings for autotypical intaglio printing

Claim 1

THE PROCESS OF MAKING A SET OF INTAGLIO PRINTING SURFACES FOR MULTI-COLOR HALF-TONE INTAGLIO PRINTING FROM A SET OF COLOR SEPARATIONS COMPRISING THE STEPS OF (A) PRODUCING INDIVIDUAL HALF-TONE DIAPOSITIVES FOR EACH COLOR SEPARATION BY SUPERPOSING ON A POSITIVE PRINT OF EACH SEPARATION AN AUTOTYPE SCREENING WHICH IS OF THE SAME FORM FOR EACH SEPARATION BUT WHEREIN THE LINES OF THE SCREEN PATTERN IN THE SEVERAL SEPARATIONS HAVE PREDETERMINED ANGULAR RELATIONSHIPS TO THE SCREEN PATTERN LINES IN THE OTHER DIAPOSITIVES TO AVOID FORMATION OF MOIRE, (B) THEN RETOUCHING EACH SCREENED DIAPOSITIVE AS REQUIRED, (C) SUBSEQUENTLY MAKING A PHOTOGRAPHIC COPY OF EACH SCREENED DIAPOSITIVE ON A SEPARATE PIECE OF PIGMENT PAPER, (D) EXPOSING EACH PIECE OF PIGMENT PAPER TO LIGHT THROUGH INTAGLIO SCREEN, SAID SCREEN HAVING A PATTERN OF IRREGULAR TRANSPARENT LINES JOINING ONE ANOTHER AT ANGULAR INTERSECTIONS CORRESPONDING TO ALL THE SAID PRE-DETERMINED ANGULAR RELATIONSHIPS BETWEEN THE SEVERAL AUTOTYPE SCREEN PATTERNS FORMED ON THE INDIVIDUAL HALF-TONE DIAPOSITIVES, AND THEN (E) TRANSFERRING THE DOUBLY SCREENED IMAGE FROM EACH PIGMENT PAPER ONTO A SEPARATE METALLIC SURFACE TO PROVIDE A RESIST ON SUCH SURFACE AND ETCHING EACH SURFACE.