Electronic thermometer

Claim 1

IN AN ELECTRONIC THERMOMETER THE COMBINATION OF MEASURING MEANS FOR INDICATING TEMPERATURES IN RESPONSE TO EFFECTIVE CURRENTS FLOWING THERETHROUGH, SAID MEASURING MEANS HAVING UNIDIRECTIONAL INDICATING MEANS ADAPTED TO INDICATE A SCALE OF SUBSTANTIALLY DIFFERING TEMPERATURES, SAID MEASURING MEANS HAVING INPUT AND OUTPUT TERMINALS, A FIRST SOURCE OF DIRECT CURRENT HAVING A POSITIVE TERMINAL AND A NEGATIVE TERMINAL, SAID FIRST SOURCE OF DIRECT CURRENT INCLUDING TRANSFORMER MEANS, FIRST CAPACITANCE MEANS AND FIRST RECTIFYING MEANS COUPLED BETWEEN SAID TRANSFORMER MEANS AND SAID FIRST CAPACITANCE MEANS FOR CHARGING SAID FIRST CAPACITANCE MEANS WITH A GIVEN POLARITY; A SECOND SOURCE OF DIRECT CURRENT HAVING A POSITIVE TERMINAL AND A NEGATIVE TERMINAL SAID SECOND SOURCE OF DIRECT CURRENT INCLUDING SAID TRANSFORMER MEANS, SECOND CAPACITANCE MEANS, AND SECOND RECTIFYING MEANS COUPLED BETWEEN SAID TRANSFORMER MEANS AND SAID SECOND CAPACITANCE MEANS FOR CHARGING SAID SECOND CAPACITANCE MEANS WITH A POLARITY OPPOSITE SAID GIVEN POLARITY; VOLTAGE REGULATING MEANS COUPLED BETWEEN SAID FIRST AND SECOND CAPACITANCE MEANS FOR STABILIZING THE VOLTAGES THEREACROSS; MEANS COUPLING THE POSITIVE TERMINAL OF ONE OF SAID SOURCES AND THE NEGATIVE TERMINAL OF THE OTHER OF SAID SOURCES TOGETHER AND WITH THE OUTPUT TERMINAL OF SAID MEASURING MEANS; FIRST RESISTANCE MEANS COUPLING THE POSITIVE TERMINAL OF SAID ONE SOURCE WITH THE INPUT TERMINAL OF SAID MEASURING MEANS WHEREBY A FIRST CURRENT IS CAUSED TO FLOW THROUGH SAID MEASURING MEANS IN ONE DIRECTION; SECOND RESISTANCE MEANS COUPLING THE NEGATIVE TERMINAL OF SAID OTHER SOURCE WITH THE INPUT TERMINAL OF SAID MEASURING MEANS WHEREBY A SECOND CURRENT IS CAUSED TO FLOW THROUGH SAID MEASURING MEANS IN A DIRECTION OPPOSITE TO SAID ONE DIRECTION; AND CIRCUIT MEANS INCLUDING A TEMPERATURE-SENSITIVE DEVICE FOR LINEARLY VARYING THE MAGNITUDE OF THE CURRENT CAUSED TO FLOW THROUGH SAID MEASURING MEANS BY ONE OF SAID RESISTANCE MEANS IN ACCORDANCE WITH THE TEMPERATURE BEING MEASURED, WHEREBY FOR A SUBSTANTIAL RANGE OF TEMPERATURES A TEMPERATURE LINEARLY VARIABLE EFFECTIVE CURRENT IS PRODUCED IN SAID MEASURING MEANS OF A MAGNITUDE EQUAL TO THE DIFFERENCE BETWEEN THE MAGNITUDES OF SAID FIRST AND SECOND CURRENTS.