Oscillogram data reader

Claim 1

APPARATUS TO FACILITATE READING DATA ON AN OSCILLOGRAM COMPRISING A FRAME TO BE PLACED OVER A PAPER BEARING OSCILLOGRAM TRACES TO BE EXAMINED, A TRANSPARENT SLIDE RECIPROCABLY MOUNTED ON SAID FRAME, THERE BEING SUBSTANTIALLY PARALLEL REFERENCE LINES ON SAID TRANSPARENT SLIDE, SAID LINES EXTENDING TRANSVERSELY TO THE DIRECTION OF RECIPROCATION OF SAID SLIDE ON SAID FRAME, SAID SLIDE CARRYING AN INDICIA PLATE ADJACENT ONE END OF THE SLIDE AND ADJACENT THE FRAME, AND SAID INDICIA PALTE BEARING NUMBERS EXTENDING IN CONSECUTIVE ORDER IN OPPOSITE DIRECTIONS FROM A CENTRALLY DISPOSED ZERO INDEX, SAID REFERENCE LINES BEING ALIGNED WITH THE REFERENCE NUMBERS WITH THE CENTERMOST REFERENCE LINE ALIGNED WITH THE ZERO INDEX FORMING A ZERO REFERENCE LINE OF ONE COLOR, AND ADDITIONAL PAIRS OF REFERENCE LINES, WITH EACH PAIR BEING DISTINCITVELY COLORED AND THE LINES OF EACH PAIR BEING DISPOSED ON OPPOSITE SIDES OF SAID ZERO REFERENCE LINE, AND AT LEAST ONE MARKER MOUNTED ON SAID FRAME AND SLIDABLE TO A PORTION TO INDICATE AN OSCILLOGRAM TRACE OTHER THAN THE TRACE UNDER EXAMINATION.