Multi-channel thermal recorder

Claim 1

A MULTI-CHANNEL OPERATION RECORDER COMPRISING A CHART STRIP OF DARK COLORED PAPER WITH AN OPAQUE LIGHT COLORED WAX COATING ON ITS FRONT SURFACE ON WHICH A DARK TRACE CAN BE PRODUCED BY LOCAL HEATING; A FRAME OR BRACKET WITH A PLURALITY OF SIMILAR, INDEPENDENTLY OPERABLE, STATIONARY, HEATING ELEMENTS HAVING A NEGATIVE TEMPERATURE COEFFICIENT; SAID HEATING ELEMENTS BEING MOUNTED AT THE BACK OF SAID CHART IN CONSTANT CONTACT THEREWITH; CLOCK MEANS FOR MOVING SAID CHART OVER SAID HEATING ELEMENTS AT A TIMED SPEED; A CASING HAVING A SUITABLE WINDOW AT ITS FRONT FACE FOR EXPOSING AN UNOBSTRUCTED VIEW OF A RECORDED PORTION OF SAID STRIP CHART, A SUPPLY ROLL FOR SUPPLYING A CONTINUOUS STRIP CHART MOUNTED IN THE BACK OF SAID CASING, A SPROCKET ROLL IN THE UPPER FORWARD PART OF SAID CASING DRIVEN BY SAID CLOCK MEANS AND A TAKE-UP ROLL MOUNTED IN THE LOWER FORWARD PART OF SAID CASING, SAID STRIP CHART BEING PROVIDED WITH SPROCKET HOLES AND BEING PASSED FROM SAID SUPPLY ROLL OVER SAID SPROCKET ROLL AND DOWN OVER SAID ELEMENTS, PAST SAID WINDOW TO SAID TAKEUP ROLL; ELECTRICAL MEANS FOR HEATING ANY ONE OR MORE OF SAID ELEMENTS, TO MAKE IT OR THEM EFFECTIVE TO PRODUCE ON THE FRONT SURFACE OF SAID CHART RECORD TRACES OF THE CONTACTS BETWEEN THE CHART AND THE ELEMENTS, AND A PLURALITY OF SWITCH MEANS, EACH FOR CONTROLLING ONE OF SAID HEATING ELEMENTS, REMOTELY LOCATED WITH RESPECT TO SAID RECORDER AND IN CONVENIENT POSITIONS WITH RESPECT TO THE OPERATION BEING RECORDED, SAID SWITCH MEANS HAVING CONDUCTORS ELECTRICALY CONNECTING THEM WITH SAID RECORDER.