Method for photographically correlating

Claim 1

A METHOD OF PREPARING A RECORD REPRESENTING A SECTIONAL VIEW OF AN AREA OF THE EARTH''S SUBSURFACE COMPRISING THE STEPS OF, ASSEMBLING A PLURALITY OF SEISMOGRAMS EACH HAVING A PLURALITY OF GALVANOMETER TRACES PHOTOGRAPHICALLY PRINTED THEREON, ALIGNING THE DATUM REFERENCE POINT OF EACH SEISMOGRAM WITH RESPECT TO THE DATUM REFERENCE POINT OF EACH ADJACENT SEISMOGRAM, THEN MARKING A DATUM REFERENCE LINE ON THE ADJACENT SEISMOGRAMS, PHOTOGRAPHICALLY REPRODUCING THE SEISMOGRAMS ON A FILM, PROJECTING THE FIRST PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM ON A NON-LIGHT TRANSMITTING PLATE WITH PHOTOSENSITIVE MATERIAL THEREBENEATH, ADJUSTING THE RELATIVE POSITIONS OF THE PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM AND THE PLATE TO ALIGN A REFERENCE MARK ON THE PLATE IN ALIGNMENT WITH THE PROJECTED DATUM REFERENCE LINE ON THE FIRST PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM, REMOVING THE PLATE AND THEN PROJECTING THE ALIGNED PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM ON THE PHOTOSENSITIVE MATERIAL, STEPWISE PROJECTING EACH SUCCESSIVE PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM ON THE PLATE AND ALIGNING THE PROJECTED DATUM REFERENCE LINE ON EACH SEISMOGRAM WITH THE REFERENCE MARK ON THE PLATE, AND AFTER EACH PROJECTION REMOVING THE PLATE TO EXPOSE A PORTION OF THE PHOTOSENSITIVE MATERIAL TO EACH ALIGNED PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM.

Claim 2

A METHOD OF PREPARING A RECORD REPRESENTING A SECTIONAL VIEW OF AN AREA OF THE EARTH''S SUBSURFACE COMPRISING THE STEPS OF, ASSEMBLING A PLURALITY OF SEISMOGRAMS EACH HAVING A PLURALITY OF GALVANOMETER TRACES PHOTOGRAPHICALLY PRINTED THEREON, ALIGNING THE DATUM REFERENCE POINT OF EACH SEISMOGRAM WITH RESPECT TO THE DATUM REFERENCE POINT OF EACH ADJACENT SEISMOGRAM, THEN MARKING A DATUM REFERENCE LINE ON THE ADJACENT SEISMOGRAMS, PHOTOGRAPHICALLY REPRODUCING THE SEISMOGRAMS ON A FILM, PROJECTING THE FIRST PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM ON A NON-LIGHT TRANSMITTING PLATE WITH PHOTOSENSITIVE MATERIAL THEREBENEATH, ADJUSTING THE RELATIVE POSITIONS OF THE PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM AND THE PLATE TO ALIGN A REFERENCE MARK ON THE PLATE IN ALIGNMENT WITH THE PROJECTED DATUM REFERENCE LINE ON THE FIRST PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM, REMOVING THE PLATE AND THEN PROJECTING THE ALIGNED PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM ON THE PHOTOSENSITIVE MATERIAL, STEPWISE PROJECTING EACH SUCCESSIVE PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM ON THE PLATE AND ALIGNING THE PROJECTED DATUM REFERENCE LINE ON EACH SEISMOGRAM WITH THE REFERENCE MARK ON THE PLATE, AND AFTER EACH PROJECTION REMOVING THE PLATE TO EXPOSE A PORTION OF THE PHOTOSENSITIVE MATERIAL TO EACH ALIGNED PHOTOGRAPHICALLY REPRODUCED SEISMOGRAM.