Lithographic color analyzer

Claim 1

IN A COLOR ANALYZER FOR LITHOGRAPHIC COLOR HALF TONES, WHICH COMPRISING A LIGHT CASING HAVING AN OPEN PLANAR END FOR APPLICATION TO AN AREA OF A MULTI-COLOR HALF TONE REPRODUCTION TO BE ANALYZED LYING IN THE PLANE OF THE OPEN END, ANY ONE COLOR OF WHICH IS TO BE ANALYZED, SAID CASING COMPRISING A LIGHT SOURCE THEREWITHIN DIRECTED TOWARD SAID OPENING, SAID CASING HAVING AT ITS OTHER END A VIEWING SCREEN DISPOSED IN SPACED PARALLEL RELATION TO SAID OPEN PLANAR END, A LENS MOUNTED WITHIN SAID CASING INTERMEDIATE SAID OPEN END AND SAID SCREEN AND OF A FOCAL LENGTH TO REPRODUCE AN IMAGE UPON SAID SCREEN IN CORRESPONDENCE WITH AN OBJECT LYING IN THE PLANE OF THE OPEN END, A RELATIVELY DARK HALF TONE SCREEN HAVING A UNIFORM DOT PERIODICITY CORRESPONDING TO THE DOT PERIODICITY OF THE COLORS OF THE HALF TONE REPRODUCTION AS PROJECTED ON THE VIEWING SCREEN; DISPOSED IMMEDIATELY BENEATH SAID VIEWING SCREEN, MEANS FACILITAING ROTATION OF THE HALF TONE SCREEN TO DISORIENT THE AXIS OF THE HALF TONE SCREEN WITH RESPECT TO THE AXIS OF ONE COLOR OF THE IMAGE OF THE MULTICOLOR HALF TONE REPRODUCTION TO PRODUCE AN INTERFERENCE PATTERN OF THAT COLOR ALONE, A VIEWING LENS DISPOSED ABOVE SAID VIEWING SCREEN FOR OBSERVATION THEREOF, AND MEANS FOR VERTICALLY ADJUSTING SAID SCREENS INTO AND OUT OF FOCUS.