Reproducing engineering data

Claim 1

THE STEPS IN THE PROCESS OF PHOTO-MECHANICALLY TRANSFERRING OF DRAWINGS FROM ONE DIMENSIONALLY STABLE SURFACE TO A REPRODUCTION DIMENSIONALLY STABLE SURFACE BY THE CONTACT METHOD UTILIZING A NEGATIVE WITH TRANSPARENT LINES AND OPAQUE COATING BETWEEN THE LINES, WHICH COMPRISES COATING SAID REPRODUCTION SURFACE WITH A WHITE SYNTHETIC LACQUER PRIMER PAINT WHICH WHEN DRY CONTAINS PORES, DRYING THE PAINT, ABRADING THE SURFACE OF THE DRY PAINT, SUCH ABRADED SURFACE PRESENTING A TOOTH FOR PENCILING AND BEING READILY ABSORPTIVE OF A THIN SENSITIZER SOLUTION, IMPREGNATING SAID PAINT WITH A COMBINED DYE AND DILUTE ORGANIC COLLOID AMMONIUM BICHROMATE SENSITIZER SOLUTION, SAID COMBINED DYE AND SENSITIZER SOLUTION BEING CAPABLE OF BEING SUBSTANTIALLY COMPLETELY ABSORBED BY SAID PAINT AND THE AMOUNT OF SAID SOLUTION BEING REGULATED TO PROVIDE SUBSTANTIALLY COMPLETE IMPREGNATION BY ABSORPTION SO THAT SAID SENSITIZING SOLUTION IS SUBSTANTIALLY COMPLETELY ABSORBED BY SAID PAINT, LOCATING SAID NEGATIVE IN FACE CONTACT WITH SAID DYE SENSITIZER SURFACE, TRANSMITTING LIGHT THROUGH SAID TRANSPARENT LINES TO RENDER INSOLUBLE THE DYE SENSITIZER IN THE PORES OF THE PAINT UNDERLYING SAID TRANSPARENT LINES, WASHING OUT THE SOLUBLE DYE SENSITIZER SOLUTION FROM THE SURFACE AND PORES OF THE PAINT TO LEAVE A POSITIVE REPRODUCTION OF SAID TRANSPARENT LINES OF THE NEGATIVE IN THE SHAPE OF COLORED LINES FORMED BY THE INSOLUBLE DYE SENSITIZER SOLUTION IN THE PORES OF THE PAINT AND PRESENTING COLORED LINES SUBSTANTIALLY FLUSH WITH THE SURFACE OF THE PAINT.