Variable resistor

Claim 1

A VARIABLE RESISTOR COMPRISING: A HOUSING OF AN ELECTRICAL INSULATING MATERIAL HAVING A CIRCULAR BASE AND A CYLINDRICAL WALL EXTENDING FROM THE EDGE OF THE BASE; A PAIR OF RELATIVELY RIGID TERMINALS EXTENDING THROUGH AND SECURED TO THE BASE OF THE HOUSING, EACH OF SAID TERMINALS HAVING A PIN PROJECTING INTO THE HOUSING; A FLAT CIRCULAR DISK OF AN ELECTRICAL INSULATING MATERIAL SEATED ON THE INNER SURFACE OF THE BASE OF SAID HOUSING, SAID DISK HAVING TWO OPENINGS THERETHROUGH THROUGH WHICH THE TERMINAL PINS EXTEND, A FILM OF AN ELECTRICAL RESISTANCE MATERIAL COATED ON THE UPPER SURFACE OF SAID DISK AND EXTENDING IN AN ARCUATE PATH AROUND THE PERIPHERY OF SAID SURFACE OF THE DISK WITH THE PATH HAVING A PAIR OF SPACED ENDS; A CONTACT TERMINATION FILM OF AN ELECTRICALLY CONDUCTIVE MATERIAL COATED ON SAID SURFACE OF THE DISK AND EXTENDING FROM ONE OF SAID OPENINGS IN THE DISK TO THE CENTER OF SAID DISK; A RESISTANCE PATH TERMINATION FILM OF AN ELECTRICALLY CONDUCTIVE MATERIAL COATED ON SAID SURFACE OF THE DISK AND EXTENDING FROM UNDER ONE END OF THE RESISTANCE PATH TO AROUND THE OTHER OPENING IN THE DISK; MEANS ELECTRICALLY CONNECTING EACH OF THE TERMINAL PINS TO ITS ADJACENT TERMINATION FILM; A CIRCULAR COVER EXTENDING ACROSS THE OPEN END OF THE CYLINDRICAL HOUSING WALL; MEANS SECURING SAID COVER TO THE HOUSING BUT PERMITTING ROTATION OF SAID COVER WITH RESPECT TO THE HOUSING; AND A CONTACT OF AN ELECTRICALLY CONDUCTIVE METAL CARRIED ON THE INNER SURFACE OF SAID COVER, SAID CONTACT HAVING A PAIR OF CONTACT ARMS EXTENDING THEREFROM, ONE OF SAID CONTACT ARMS SLIDABLY ENGAGING SAID RESISTANCE PATH AND THE OTHER CONTACT ARM SLIDABLY ENGAGING SAID CONTEACT TERMINATION FILM.