Chart scanning apparatus

Claim 1

A CHART SCANNING APPARATUS, ESPECIALLY FOR DRILL STEM TESTS CHARTS, COMPRISING A BROAD BASE MEANS; FIRST GUIDEWAY MEANS SECURED ON THE BASE MEANS DISPOSED ALONG ONE EDGE THEREOF AND COMPRISING A FIRST PAIR OF PARALLEL, SPACED APART GUIDE RAILS DEFINING THEREBETWEEN A FIRST GUIDEWAY; SECOND GUIDEWAY MEANS SECURED ON THE BASE MEANS DISPOSED ALONG THE EDGE THEREOF OPPOSITE SAID ONE EDGE AND COMPRISING A SECOND PAIR OF PARALLEL, SPACED APART GUIDE RAILS DEFINING THEREBETWEEN A SECOND GUIDEWAY; MAJOR SLIDING MEANS COMPRISING A FIRST CARRIAGE MEANS MOVABLE ALONG THE FIRST GUIDEWAY, A SECOND CARRIAGE MEANS MOVABLE ALONG THE SECOND GUIDEWAY, AND A PAIR OF PARALLEL, FIRST RESILIENT MEANS FOR APPLYING A FORCE AGAINST AT LEAST ONE OF SAID FIRST AND SECOND CARRIAGE MEANS TO CAUSE THE ONE CARRIAGE MEANS TO NORMALLY BEAR AGAINST ONE OF THE GUIDE RAILS SPACED APART CROSS RAILS SECURED AT THE OPPOSITE ENDS THEREOF TO THE FIRST AND SECOND CARRIAGE MEANS AND ADAPTED TO MOVE THEREWITH ALONG THE FIRST AND SECOND GUIDEWAYS, SAID PAIR OF CROSS RAILS DEFINING THEREBETWEEN A THIRD GUIDEWAY; MINOR SLIDING MEANS COMPRISING A THIRD CARRIAGE MEANS CARRYING POINTER MEANS MOVABLE ALONG SAID THIRD GUIDEWAY AND SECOND RESILIENT MEANS FOR APPLYING A FORCE AGAINST THE THIRD CARRIAGE MEANS TO CAUSE THE THIRD CARRIAGE MEANS TO NORMALLY BEAR AGAINST ONE OF THE CROSS RAILS; ELONGATED FIXED FIRST SCALES ON ONE RAIL OF EACH OF SAID PAIRS OF GUIDE RAILS AND ON ONE OF SAID CROSS RAILS AND EXTENDING ALONG, RESPECTIVELY, SAID FIRST, SECOND AND THIRD GUIDEWAYS; VERNIER SCALES MOUNTED ON EACH OF SAID FIRST, SECOND AND THIRD CARRIAGE MEANS CLOSE TO AND PARALLEL TO A RESPECTIVE SAID FIRST SCALE FOR ACCURATELY READING SAID FIRST SCALES; AND ABUTMENT MEANS ADJACENT THE OPPOSITE ENDS OF SAID FIRST AND SECOND GUIDEWAY MEANS FOR RETAINING SAID FIRST AND SECOND CARRIAGE MEANS IN SAID FIRST AND SECOND GUIDEWAYS AND FOR LOCATING A CHART TO BE WORKED UPON, SAID VERNIER SCALES ON SAID FIRST AND SECOND CARRIAGE MEANS BEING MOVABLE TOGETHER LONGITUDINALLY ALONG SAID GUIDE RAILS AND SAID VERNIER SCALE OF SAID THIRD CARRIAGE MEANS BEING MOVABLE INDEPENDENTLY OF SAID VERNIER SCALES ON FIRST AND SECOND CARRIAGE MEANS ALONG SAID CROSS RAILS WHEREBY SAID POINTER MEANS MAY BE ACCURATELY POSITIONED ON SAID CHART.