Drawing reproduction method

Claim 1

IN A METHOD OF REPRODUCING LARGE DRAWINGS, THE STEPS OF FORMING A SUPPORT FOR SAID DRAWING HAVING A PLURALITY OF SPACED RESILIENTLY MOUNTED ALIGNMENT MARKERS ALONG THE TWO MAJOR EDGES OF THE DRAWING, PLACING A FIRST SENSITIZED PLATE TRANSVERSELY ACROSS ONE END OF THE DRAWING AND COVERING THE FIRST FOUR ALIGNMENT MARKERS, EXPOSING SAID PLATE TO OBTAIN A NEGATIVE OF A FIRST SECTION OF THE DRAWING AND THE FOUR ALIGNMENT DESIGNS, REMOVING THE FIRST PLATE AND DEVELOPING THE SAME, PLACING A SECOND SENSITIZED PLATE TRANSVERSELY ACROSS THE DRAWING BUT POSITIONING IT FURTHER TOWARD THE MIDDLE OF THE DRAWING BY ONE TRANSVERSE SET OF ALIGNMENT MARKERS, EXPOSING SAID SECOND SENSITIZED PLATE AND REMOVING AND DEVELOPING THE SAME, POSITIONING AS MANY MORE SENSITIVE PLATES AS ARE NECESSARY TO COVER THE REMAINDER OF THE DRAWING MOVING ONE SET OF ALIGNMENT MARKERS ALONG THE TRANSVERSE AXIS EACH TIME A NEW SENSITIZED PLATE IS APPLIED UNTIL THE WHOLE DRAWING HAS BEEN COVERED AND SECTIONAL NEGATIVES HAVING ALIGNMENT MARKERS HAVE BEEN MADE, SUBSTITUTING A SENSITIZED SHEET OF DIMENSIONALLY STABLE MATERIAL OF THE SAME SIZE AS THE ORIGINAL DRAWING FOR THE SAME, PLACING THE FIRST NEGATIVE MADE FROM THE FIRST SENSITIZED PLATE OVER THE FIRST FOUR ALIGNMENT MARKERS ON ONE END OF THE SENSITIZED SHEET WITH DEVELOPED ALIGNMENT DESIGNS ON THE NEGATIVE IN EXACT REGISTRATION WITH THOSE ON THE FIRST FOUR ALIGNMENT MARKERS, COVERING WITH OPAQUE MATERIAL THE REMAINDER OF THE SENSITIZED SHEET, EXPOSING THE FIRST NEGATIVE PLATE FOR THE PROPER LENGTH OF TIME, REMOVING THE FIRST NEGATIVE PLATE PLACING THE SECOND NEGATIVE PLATE ONE SET OF ALIGNMENT MARKERS TO ONE SIDE OF THE LOCATION OF THE FIRST AND AGAIN ALIGNING THE DEVELOPED DESIGNS ON THE CORNERS OF THE SECOND NEGATIVE PLATE WITH THE ALIGNMENT MARKERS ON THE SUPPORTING MEANS, COVERING WITH OPAQUE MEANS THE REMAINDER OF THE SENSITIZED SHEET SO THAT IT WILL NOT BE AFFECTED BY LIGHT, EXPOSING THE SECOND NEGATIVE PLATE AND PROCEEDING IN THE SAME MANNER UNTIL ALL OF THE NEGATIVE PLATES HAVE BEEN PRINTED ON THE SENSITIZED SHEET AND LASTLY REMOVING THE SENSITIZED SHEET AND DEVELOPING THE SAME AS A POSITIVE PRINT.