Liquid level gauge

Claim 1

A GAUGE COMPRISING (A) A HOUSING HAVING A TRANSPARENT WALL AT ONE END THEREOF, (B) A STATIONARY PIVOT PIN EXTENDING INTO SAID HOUSING FROM THE OPPOSITE END THEREOF, (C) A DIAL IN SAID HOUSING FACING SAID TRANSPARENT WALL AND HAVING GRADUATIONS DISPOSED COAXIALLY ABOUT SAID PIN, (D) A FIRST ANNULAR MAGNET MOUNTED ON SAID PIN FOR ROTATION COAXIALLY THEREABOUT, (E) A POINTER MOUNTED FOR ROTATION WITH SAID MAGNET AND OVERLYING THE GRADUATIONS ON SAID DIAL TO BE READABLE THEREAGAINST THROUGH SAID TRANSPARENT WALL, (F) AN ARCUATE RESISTOR FIXED IN SAID HOUSING COAXIALLY OF SAID PIN, (G) MEANS TO CONNECT SAID RESISTOR IN CIRCUIT WITH AN ELECTRICALLY OPERATED INDICATOR LOCATED REMOTE FROM SAID HOUSING, (H) SAID MEANS INCLUDING AN ELECTRICAL CONTACT ELEMENT MOUNTED IN SAID HOUSING TO ROTATE WITH SAID MAGNET AND HAVING A CONTACT POINT WHICH RIDES ALONG SAID RESISTOR COAXIALLY OF SAID PIN UPON ROTATION OF SAID MAGNET, SAID CONTACT POINT BEING RADIALLY SPACED INWARDLY FROM THE OUTER PERIPHERAL SURFACE OF SAID FIRST MAGNET, AND (I) A SECOND MAGNET MOUNTED AT THE EXTERIOR OF SAID HOUSING TO ROTATE COAXIALLY OF SAID PIN IN RESPONSE TO A CHANGE IN A CONDITION EXISTING AT THE EXTERIOR OF SAID HOUSING AND BEING OPERATIVE THROUGH MAGNETIC COUPLING TO IMPART ITS ROTATION TO SAID FIRST MAGNET, (J) SAID MEANS FURTHER INCLUDING A LEAF SPRING SECURED AT ONE END TO SAID FIRST MAGNET FOR ROTATION THEREWITH, (K) SAID SPRING ADJACENT THE OPPOSITE END THEREOF EXTENDING TANGENTIALLY ACROSS SAID PIN, AND HAVING SLIDING, TANGENTIAL, POINT CONTACT WITH THE PERIPHERAL SURFACE OF SAID PIVOT PIN UPON ROTATION OF SAID FIRST MAGNET.