Recording titration device for recording titration curves

Claim 1

IN A RECORDING TITRATION DEVICE PROVIDED WITH A CHEMICAL CELL ADAPTED TO CONTAIN A QUANTITY OF TEST SPECIMEN HAVING ELECTRODES BETWEEN WHICH THE E.M.F. OF THE CELL IS PRODUCED, SUPPLY MEANS FOR INTRODUCING A TITRATING AGENT INTO SAID CELL, AND RECORDING MEANS COMPRISING A CHART AND A WRITING MEMBER IN COOPERATION THEREWITH, A FIRST DRIVING MEANS FOR MUTUALLY RELATIVE MOVEMENT OF SAID CHART AND SAID WRITING MEMBER IN A FIRST CO-ORDINATE DIRECTION, A SECOND DRIVING MEANS FOR SIMULTANEOUSLY FEEDING OF TITRATING AGENT FROM SAID SUPPLY MEANS FOR INTRODUCING TITRATING AGENT INTO SAID CELL, AND FOR MUTUALLY RELATIVE MOVEMENT OF SAID CHART AND SAID WRITING MEMBER IN A SECOND CO-ORDINATE DIRECTION, SAID FIRST DRIVING MEANS COMPRISING AN ELECTRIC MOTOR CONNECTED WITH A SUPPLY CIRCUIT, A POTENTIOMETER HAVING TWO END TERMINALS AND A SLIDING CONTACT, SAID END TERMINALS BEING CONNECTED WITH A VOLTAGE SUPPLY MEANS, SAID SLIDING CONTACT BEING IN DRIVING CONNECTION WITH SAID FIRST DRIVING MEANS, AN ELECTRIC CONTROL DEVICE COMPRISING AN INPUT CIRCUIT AND AN OUTPUT CIRCUIT AND MEANS RENDERING SAID OUTPUT CIRCUIT OPERATIVE UPON THE APPLICATION UPON SAID INPUT CIRCUIT OF A VOLTAGE DIFFERENT FROM A PRE-DETERMINED VOLTAGE, SAID E.M.F. FROM SAID CELL BEING CONNECTED TO SAID INPUT CIRCUIT IN SERIES WITH THE VOLTAGE BETWEEN SAID SLIDING CONTACT AND ONE OF SAID END TERMINALS OF SAID POTENTIOMETER, SAID OUTPUT CIRCUIT BEING CONNECTED WITH SAID SECOND DRIVING MEANS FOR REESTABLISHING SAID PRE-DETERMINED VOLTAGE ON SAID INPUT CIRCUIT.