Data reading apparatus

Claim 1

A DATA READER FOR USE WITH A LONGITUDINALLY EXTENDING OSCILLOGRAM SHEET HAVING A GENERALLY LONGITUDINAL TRACE THEREON AND HAVING A LONGITUDINAL REFERENCE LINE THEREON IN PREDETERMINED SPACED RELATIONSHIP TO A ZERO POSITION FOR SAID TRACE WHICH DATA READER COMPRISES IN COMBINATION, A MAIN BODY HAVING AN UPWARDLY EXPOSED FLAT FACE ADAPTED TO SUPPORT A SHEET SUCH AS AFORESAID WITH SAID LONGITUDINAL REFERENCE LINE IN GENERALLY PARALLEL RELATIONSHIP WITH ONE OF ITS SIDES, A READING HEAD ON THE BODY AT SAID EXPOSED FACE THEREOF WHICH READING HEAD INCLUDES INSTRUMENTALITIES FOR READING DATA REPRESENTED BY A TRACE ON SUCH A SHEET SUPPORTED ON SAID EXPOSED FACE, A LONGITUDINAL ROD LOCATED IN A FIXED POSITION AT SAID ONE SIDE OF SAID BODY AND ARRANGED PARALLEL TO SAID BODY FACE AND TO THE REFERENCE LINE OF A SHEET SUCH AS AFORESAID SUPPORTED ON SAID FACE, A GUIDE MEMBER LONGITUDINALLY MOVABLE ALONG SAID ROD, A TRANSVERSE ROD FIXEDLY CONNECTED AT ONE END WITH SAID GUIDE MEMBER AND LONGITUDINALLY MOVABLE IN UNISON THEREWITH, MEANS CONNECTING SAID READING HEAD WITH SAID SECOND ROD FOR TRANSVERSE MOVEMENT ALONG SAID ROD, INDICATING MEANS ON SAID READING HEAD REGISTRABLE WITH SAID LONGITUDINAL REFERENCE LINE SO AS TO FACILITATE PROPER TRANSVERSE POSITIONING OF SAID READING HEAD WITH RESPECT TO SAID TRACE, AND MEANS CARRIED BY SAID CONNECTING MEANS FOR RELEASABLY HOLDING SAID READING HEAD IN A SELECTED TRANSVERSE POSITION ON SAID TRANSVERSE ROD.