saylor

Claim 1

IN A LIQUID-LEVEL INDICATING APPARATUS, A FIRST ELONGRATED CYLINDRICAL TUBE POSITIONED UPRIGHT WITH ITS LOWER AND SUBMMERGED IN THE LIQUID TO BE MEASURED, A SECOND ELONGATED CYLINDRICAL TUBE OF SMALLER DIAMETER THAN THAT OF THE TUBE AND DISPOSED UPRIGHT WITHIN THE FIRST TUBE IN FIXED POSITION WITH REFERENCE THERETO, THE FIRST AND SECOND TUBES BEING SUBSTANTIALLY CO-EXTENSIVE, A HORSESHOE MAGNET POSITIONED WITHIN THE FIRST TUBE WITH ITS POLE FACES CLOSELY ADJACENT TO THE OUTER SURFACE OF THE SECOND TUBE ON RESPECTIVE OPPOSITE SIDES THEREOF, A FLOAT WITHIN THE FIRST TUBE, THE MAGNET BEING SECURED FIXED TO THE FLOATED TO BE BUOYED TO THE SURFACE OF THE LIQUID TO BE MEASURED, A PAIR OF RESISTANCE WIRES EXTENDING LENGTHWISE INSIDE THE SECOND TUBE SUBSTANTIALLY COEXTENSIVE THEREWITH AND INSULATED THEREFROM, A CYLINDRICAL ARMATURE IN THE SECOND TUBE AND HELD AT THE LEVEL OF THE POLE FACES BY THE ATTRACTION OF THE MAGNET, THE ARMATURE BEING PROVIDED WITH A PAIR OF APERTURES COMPANION TO THE PAIR OF RESISTANCE WIRES FOR PASSAGE THEREOF, A BUS BAR SECURED FIXEDLY TO THE ARMATURE AND POSITIONED TO SLIDE ALONG THE PAIR OF RESISTANCE WIRES IN CIRCUIT-CLOSING CONTACT THEREWITH, AND AN ELECTRICAL MEASURING DEVICE CONNECTED ACROSS THE ENDS OF THE PAIR OF RESISTANCE WIRES AND OPERATIVE TO MEASURE THE RESISTANCE OF THOSE PORTIONS OF THE SEVERAL WIRES OF THE PAIR WITHIN THE CIRCUIT OF THE BUS BAR, AS DETERMINED BY THE POSITION OF THE FLOAT TO INDICATE THE SURFACE LEVEL OF THE LIQUID TO BE MEASURED.