Position-to-voltage translator

Claim 1

IN COMBINATION: A RADAR SYSTEM INCLUDING A PLAN POSITION INDICATOR DISPLAY SCREEN AND A SWEEP CIRCUIT FOR PRODUCING THEREON A VISUAL TARGET SIGNAL REPRESENTATIVE OF DETECTED INTELLIGENCE, SAID SWEEP CIRCUIT HAVING ENERGIZATION POTENTIAL PASSING THERETHROUGH TO DEFINE A RADAR SWEEP PERIOD AND A RETRACE PERIOD; MARKER CIRCUIT MEANS FOR APPLYING RECTANGULAR COORDINATE SIGNALS TO SAID RADAR SYSTEM DURING SAID RETRACE PERIOD SO AS TO PRODUCE ON THE DISPLAY SCREEN THEREOF FOUR VISUAL MARKER SIGNALS CIRCUMSCRIBING A DEFINITIVE AREA OF SAID DISPLAY SCREEN, SAID MARKER CIRCUIT MEANS INCLUDING A MODULATION AND MARKER BRIGHTENING UNIT FOR PROVIDING SUFFICIENT DEFLECTION MODULATION AND INTENSIFICATION SO THAT SAID CIRCUMSCRIBING MARKER SIGNALS MAY BE READILY DETECTED BY A LIGHT DETECTOR UNIT; A MOVABLE LIGHT DETECTOR ADAPTED TO BE PLACED OVER SAID VISUAL TARGET SIGNAL AND PRODUCE AN OUTPUT VOLTAGE REPRESENTATIVE OF THE DEGREE OF ALIGNMENT OF SAID DETECTOR WITH RESPECT TO THE POSITIONS OF SAID FOUR VISUAL MARKER SIGNALS;