Function generators having multiple rations between input and output

Claim 1

A FUNCTION GENERATOR HAVING A PLURALITY OF DISCRETE RATIO OF INCREMENTAL INPUT TO INCREMENTAL OUTPUT AUTOMATICALLY SELECTABLE BY CHANGE IN THE MAGNITUDE OF SAID OUTPUT, COMPRISING A D.C. AMPLIFIER HAVING AN INPUT CIRCUIT, AN OUTPUT CIRCUIT AND NEGATIVE FEEDBACK CIRCUIT FOR ESTABLISHING A SELECTED INCREMENTAL RATION BETWEEN THE DIRECT CURRENT INPUT AND THE DIRECT CURRENT OUTPUT OF SAID AMPLIFIER AND FOR MAINTAINING TO A CLOSE APPROXIMATION AT A REFERENCE POTENTIAL AN INPUT JUNCTION OF SAID AMPLIFIER, AN INPUT RESISTOR CONNECTED IN SAID INPUT CIRCUIT ON THE INPUT SIDE OF SAID INPUT JUNCTION, A ZERO-INTERCEPT CIRCUIT INCLUDING RESISTANCE MEANS, A SOURCE OF SUPPLY, AND SAID INPUT RESISTOR FOR PRODUCING AN OUTPUT FROM SAID AMPLIFIER WHEN SAID INPUT IS ZERO, CONTROL CIRCUIT MEANS IN SHUNT WITH SAID FEEDBACK CIRCUIT AND INCLUDING A SOURCE FO CURRENT, AN IMPEDANCE ELEMENT AND TWO SEMI-CONDUCTOR JUNCTIONS EACH OPERABLE BETWEEN CONDUCTIVE AND NON-CONDUCTIVE STATES FOR SELECTIVE FLOW OF CURRENT FROM SAID SORUCE TO SAID INPUT CIRCUIT OR TO SAID OUTPUT CIRCUIT DEPENDING UPON THE POLARITY OF SAID SOURCE OF CURRENT AND THE CONBIASING MEANS CONNECTED TO CONTROL THE CONDUCTIVITIES OF SAID SEMI-CONDUCTOR TO CONTROL THE CONDUCTIVITIES SAID SEMI-CONDUCTOR JUNCTIONS FOR MAINTAINING THEM IN SELECTED STATES OF CONDUCTIVITY AND EACH IN TURN RESPONSIVE TO CHANGE IN THE OUTPUT OF SAID AMPLIFIER FOR PRODUCING CHANGES IN SAID STATES OF CONDUCTIVITY OF SAID SEMI-CONDUCTOR JUNCTIONS AS SAID OUTPUT ATTAINS PREDETERMINED LEVELS, THEREBY TO SHIFT SAID FLOW OF CURRENT BETWEEN SAID INPUT AND OUTPUT CIRCUITS.