Graphical recording

Claim 1

IN A GRAPHICAL RECORDING SYSTEM FOR PRODUCING A TRACE REPRESENTING AT LEAST ONE VARIABLE ON A RECORDING MEDIUM, WHEREIN THE SYSTEM COMPRISES, IN COMBINATION, A RECORDING MEDIUM, A PEN ADAPTED TO PRODUCE A TRACE ON THE SURFACE OF THE RECORDING MEDIUM, A PEN CARRIER CONNECTED TO THE PEN ADAPTED TO MAINTAIN THE PEN IN PROXIMITY TO THE SURFACE MEANS CONNECTED TO THE PEN CARRIER AND ADAPTED TO POSITION THE PEN WITH RESPECT TO THE SURFACE IN RESPONSE TO AT LEAST ONE VARIABLE, AN INK RESERVOIR COUPLED TO THE PEN AND ADAPTED TO CONTAIN NONAQUEOUS INK HAVING AN INITIAL SOFTENING POINT ABOVE AMBIENT TEMPERATURE AND TO PASS THE INK TO THE PEN, HEATING MEANS CONNECTED TO THE RESERVOIR AND ADAPTED TO SUPPLY THE INK TO THE PEN IN FLUIDIZED CONDITION, WHEREBY THE INK CAN BE READILY DEPOSITED AS A FLUID ON THE SURFACE AND CAN BE READILY SOLIDIFIED ON THE SURFACE TO FORM A PERMANENT TRACE CORRESPONDING TO MOVEMENTS OF THE PEN CARRIER RELATIVE TO THE RECORDING MEDIUM IN RESPONSE TO THE VARIABLE, THE IMPROVEMENT WHICH COMPRISES A DIMENSIONALLY STABLE FLEXIBLE, MOISTURE RESISTANT RECORDING SURFACE FOR SAID RECORDING MEDIUM AT LEAST SAID RECORDING SURFACE OF SAID RECORDING MEDIUM COMPRISING NORMALLY SOLID, THERMALLY FLUIDIZABLE MATERIAL COMPATIBLE WITH SAID INK, HAVING AN INITIAL SOFTENING POINT AT LEAST ABOUT THAT OF SAID INK, AND SELECTED FROM THE GROUP CONSISTING OF SYNTHETIC THERMOPLASTIC RESIN, WAX AND MIXTURES THEREOF, WHEREBY IMPROVED DIMENSIONAL STABILITY OF A TRACE IS PROVIDED.