Fuel level warning means

Claim 1

IN A DEVICE OF THE CLASS DESCRIBED, A RESERVOIR FOR STORING FLUID, FIRST MEANS FOR GENERATING A CONTROL SIGNAL RELATED TO FLUID LEVEL IN SAID RESERVOIR, SECOND MEANS OPERABLE TO INDICATE AN ON AND AN OFF CONDITION, AND CONTROL MEANS DRIVEN BY SAID CONTROL SIGNAL AND CONNECTED TO SECOND MEANS FOR OPERATING THEREOF TO ITS ON CONDITION WHENEVER FLUID IS SAID RESERVOIR FALLS BELOW A PREDETERMINED LEVEL AND TO ITS OFF CONDITION WHENEVER FLUID IS SAID RESERVOIR IS ABOVE SAID PREDETERMINED LEVEL, SAID CONTROL MEANS INCLUDING A SEMI-CONDUCTOR HAVING A CONTROL ELECTRODE, AND A FIRST VOLTAGE DIVIDER INCLUDING ADJUSTABLE MEANS IN CIRCUIT WITH SAID CONTROL ELECTRODE FOR ESTABLISHING BIAS OF SAID SEMI-CONDUCTOR THEREBY ESTABLISHING THE PREDETERMINED LEVEL AT WHICH SAID SECOND MEANS SWITCHES BETWEEN ITS SAID ON AND OFF CONDITIONS, SAID FIRST MEANS INCLUDING A SECOND VOLTAGE DIVIDER CONNECTED IN PARALLEL WITH SAID FIRST VOLTAGE DIVIDER, SAID SECOND VOLTAGE DIVIDER COMPRISING A VARIABLE IMPEDANCE ELEMENT AND ANOTHER IMPEDANCE ELEMENT CONNECTED IN ELECTRICAL SERIES, SAID CONTROL MEANS CONNECTED IN CIRCUIT WITH SAID SECOND VOLTAGE DIVIDER AT A POINT BETWEEN SAID IMPEDANCE ELEMENTS, A FLOAT IN SAID TANK CONNECTED TO SAID VARIABLE IMPEDANCE ELEMENT FOR VARYING IMPEDANCE OF THE LATTER IN ACCORDANCE WITH FLUID LEVEL IN SAID RESERVOIR.