Analog ratio computer using hall generator

Claim 1

A CIRCUIT FOR PERFORMING ANALOG DIVISION COMPRISING: (A) A HALL PLATE, (B) A FIRST VOLTAGE SOURCE FOR APPLYING A HALL CURRENT TO SAID HALL PLATE, (C) CONTROLLED MEANS FOR SUBJECTING SAID HALL PLATE TO A MAGNETIC FIELD WHEREBY A HALL CURRENT APPLIED TO SAID PLATE AT RIGHT ANGLES TO SAID MAGNETIC FIELD WILL GENERATE A HALL VOLTAGE ACROSS SAID HALL PLATE, SAID HALL VOLTAGE BEING DIRECTLY PROPORTIONAL TO THE PRODUCT OF THE HALL CURRENT AND THE EFFECTIVE MAGNETIC FIELD, (D) A DIFFERENTIAL AMPLIFIER HAVING AN ARBITRARY INPUT SIGNAL FED THERETO, (E) SAID HALL VOLTAGE ALSO BEING FED TO SAID DIFFERENTIAL AMPLIFIER WHICH PRODUCES AN OUTPUT SIGNAL PROPORTIONAL TO THE DIFFERENCE BETWEEN SAID HALL VOLTAGE AND SAID ARBITRARY INPUT SIGNAL, (F) AN ELECTRO-OPTIC TRANSDUCER, CNSISTING OF A LAMP AND A PHOTORESISTOR, USED AS A FEEDBACK ELEMENT, (G) A RESISTANCE, TO WHICH THE OUTPUT OF SAID DIFFERENTIAL AMPLIFIER IS FED, IN SERIES WITH SAID LAMP, (H) A BIAS VOLTAGE SOURCE CONNECTED TO THE JUNCTION OF SAID RESISTANCE AND LAMP FOR SETTING SAID LAMP AT A MAXIMUM CLOSED LOOP POWER GAIN AND A MINIMUM CONTROL POWER REQUIREMENT, (I) THE LIGHT INTENSITY OF SAID LAMP CONTROLLING THE MAGNITUDE OF SAID PHOTORESISTOR, (J) SAID PHOTORESISTOR BEING CONNECTED IN SERIES WITH SAID FIRST VOLTAGE SOURCE AND CONSEQUENTLY CONTROLLING SAID HALL CURRENT, (K) SAID ELECTRO-OPTIC TRANSDUCER COMPLETING A FEEDBACK LOOP AROUND SAID DIFFERENTIAL AMPLIFIER AND ALSO ISOLATING THE HALL CURRENT INPUT FROM THE OUTPUT CIRCUIT OF THE HALL PLATE.