Electrical apparatus for fiber detection

Claim 1

AN ELECTRICAL CIRCUIT FOR DETECTING THE PRESENCE OF FIBRIN IN A BLOOD SPECIMEN IN PROTHROMBIN TIME DETERMINATIONS COMPRISING: A PAIR OF ELECTRODES, ONE OF SAID ELECTRODES BEING MOVABLE INTO AND OUT OF SAID SPECIMEN AND THE OTHER OF SAID ELECTRODES BEING STATIONARY IN SAID SPECIMEN, DRIVE MEANS FOR MOVING THE MOVABLE ELECTRODE INTO AND OUT OF SAID SPECIMEN, FIRST SWITCH MEANS IN SAID CIRCUIT FOR PERMITTING AN ELECTRICAL POTENTIAL TO BE APPLIED ACROSS SAID ELECTRODES, SYNCHRONIZATION MEANS SYNCHRONIZED WITH THE OPERATION OF SAID DRIVE MEANS FOR REMOVING THE ELECTRICAL POTENTIAL ACROSS SAID ELECTRODES WHEN SAID MOVABLE ELECTRODE IS IMMERSED IN SAID SPECIMEN AND FOR PERMITTING THE APPLICATION OF SAID ELECTRICAL POTENTIAL WHEN SAID MOVABLE ELECTRODE IS OUT OF SAID SPECIMEN, SAID SYNCHRONIZATION MEANS INCLUDING SWITCH CLOSING MEANS FOR CLOSING SAID SWITCH UPON LIFTING OF FIBRIN FROM SAID SPECIMEN BY THE MOVABLE ELECTRODE TO THEREBY PROVIDE A CURRENT PATH BETWEEN SAID ELECTRODES THROUGH THE FIBRIN AND SPECIMEN, AND ELECTRICAL MEANS IN RESPONSE TO SAID SWITCH CLOSING MEANS FOR DEACTIVATING THE OPERATION OF THE DRIVE MEANS WHEN THE CURRENT PATH BETWEEN SAID ELECTRODES IS SO PROVIDED, A SECOND SWITCH MEANS FOR ENERGIZING SAID DRIVE MEANS, MAGNETIC MEANS DRIVEN BY SAID DRIVE MEANS, A MAGNETICALLY EXCITABLE SWITCH ADAPTED TO BE CLOSED UPON EACH TRAVERSAL OF SAID MAGNETIC MEANS IN CLOSE PROXIMITY THERETO, A COUNTER COUPLED WITH SAID MAGNETICALLY EXCITABLE SWITCH AND ADAPTED TO REGISTER A DIGITAL AMOUNT UPON EACH CLOSURE OF SAID MAGNETICALLY EXCITABLE SWITCH.