Single faraday cell polarimeter

Claim 1

IN A POLARIMETER HAVINGA SINGLE FARADAY CELL AND A PHOTODECTOR RECEIVING LIGHT PASSING THROUGH A SAMPLE AND SAID FARADAY CELL, MEANS FOR APPLYING TO THE FARADAY CELL ON OSCILLATING ELECTRIC CONTROL SIGNAL HAVING A SQUARE WAVE-FORM SYMMETRICALLY DISPOSED ABOUT A REFERENCE AXIS AND WITH EQUAL POSITIVE AND NEGATIVE PULSE WIDTHS, COMPRISING A FREQUENCY GENERATOR, AN INTEGRATING CIRCUIT SUPPLIED THEREBY AND DELIVERING AN OUTPUT HAVING A SAWTOOTH WAVE-FORM, AND A TRIGGER CIRCUIT RESPONSIVE TO THE OUTPUT OF THE INTEGRATING CIRCUIT TO DEVELOP THE CONTROL SIGNALS; AND RATIO ADJUSTMENT MEANS FOR ADJUSTING THE RATIO OF THE POSITIVE PULSE WIDTH TO THE NEGATIVE PULSE WIDTH IN ANY COMPLETE CYCLE OF OSCILLATION COMPRISING A CONVERTER BY WHICH THE OUTPUT OF SAID LIGHT-RECEIVING DETECTOR IS CONVERTED INTO A DIRECT CURRENT POTENTIAL, AND SAID TRIGGER CIRCUIT TO WHICH THE DIRECT CURRENT POTENTIAL AND THE OUTPUT OF SAID INTEGRATING MEANS ARE APPLIED TO ADJUST THE OPERATION OF THE TRIGGER CIRCUIT AND THEREBY THE PULSE WIDTH RATIO OF THE CONTROL SIGNAL.