Ambient-compensated control system for clothes dryers

Claim 1

IN A CLOTHES DRYING MACHINE: (A) A CLOTHES CONTAINER; (B) MEANS INCLUDING AN ELECTRIC MOTOR FOR EFFECTING TUMBLING OF CLOTHES IN SAID CONTAINER, SAID MOTOR INCLUDING AN AUXILIARY WINDING PROVIDING A LOW-VOLTAGE OUTPUT; (C) A MAIN HEATER POSITIONED TO HEAT CLOTHES IN SAID CONTAINER; (D) THERMOSTATIC MEANS RESPONSIVE TO THE TEMPERATURE OF CLOTHES IN SAID CONTAINER AND EFFECTIVE TO SHUT OFF SAID MAIN HEATER IN RESPONSE TO A PREDETERMINED HIGH TEMPERATURE; (E) A TRANSISTOR HAVING A BASE, AN EMIITER, AND A COLLECTOR; (F) MEANS FOR RECTIFYING THE OUTPUT OF SAID AUXILIARY WINDING; (G) A VARIABLE FIRST RESISTOR HAVING A RESISTANCE WHICH VARIES SUBSTANTIALLY AS ITS TEMPERATURE VARIES AND CONNECTED AT ONE END TO SAID TRANSISTOR BASE, SAID RESISTOR BEING POSITIONED TO SENSE AMBIENT AIR TEMPERATURE; (H) A SECOND RESISTOR CONNECTED AT ONE END TO SAID TRANSISTOR BASE, SAID AUXILIARY WINDING BEING CONNECTED ACROSS THE OTHER ENDS OF SAID RESISTORS; (I) AN ELECTRIC RESISTANCE-TYPE BIASING HEATER POSITIONED IN HEATING RELATION TO SAID THERMOSTATIC MEANS SO AS TO DECREASE THE CLOTHES TEMPERATURE REQUIRED TO SHUT OFF SAID MAIN HEATER; (J) ONE OF SAID RESISTORS HAVING ITS OTHER END CONNECTED TO SAID EMITTER IN AN EMITTER LOOP, AND THE OTHER OF SAID RESISTORS HAVING ITS OTHER END CONNECTED TO SAID COLLECTOR IN A COLLECTOR LOOP; (K) SAID BIASING HEATER BEING CONNECTED WITH ONE OF SAID RESISTORS IN ONE OF SAID LOOPS, SAID AUXILIARY WINDING BEING CONNECTED BETWEEN SAID ONE RESISTOR AND SAID BIASING HEATER; (L) WHEREBY A CHANGE IN THE RESISTANCE OF SAID VARIABLE RESISTOR CAUSES A CHANGE IN THE LEVEL OF ENERGIZATION OF SAID BIASING HEATER SO THAT THE CLOTHES TEMPERATURE REQUIRED TO SHUT OFF SAID MAIN HEATER RISES AND FALLS AS THE AMBIENT TEMPERATURE RISES AND FALLS.