Multi-turn potentiometer

Claim 1

A RESISTOR HAVING AN INFINITELY VARIABLE RESISTANCE CHANGE COMPRISING AN INSULATED TUBE, A METALLIC RESISTANCE FILM DEPOSITED ON THE INNER SMOOTH CYLINDERICAL WALL OF SAID TUBE FORMING A HELICAL RESISTANCE PATH, METALLIC TERMINALS AT THE ENDS OF SAID TUBE AND IN CONTACT WITH THE ENDS OF SAID HELICAL FILM, A SLOTTED TUBE, A COAXIAL FIXED THREADED ROD, A THREAD COLLAR COMPRISING A CIRCULAR SECTION TERMINATING IN A SECTION NECKED DOWN INTERMEDIATE ITS ENDS, SAID CIRCULAR SECTION EMBRACING SAID THREADED ROD AND SAID NECKED DOWN SECTION EXTENDING THROUGH AND GUIDELY EMBRACING THE EDGES OF THE SLOT IN SAID SLOTTED TUBE AND CARRYING A CONCENTRIC MOVABLE SLIDER IN CONTACT WITH SAID METALLIC RESISTANCE FILM, MEANS FOR ADJUSTING THE RESISTANCE OF SAID RESISTOR BY SLIDING SAID CONTACT ALONG SAID RESISTANCE PATH FROM ONE END TO THE OTHER, TO PROVIDE AN INFINITELY VARIABLE CHANGE OF RESISTANCE BETWEEN THE SLIDER AND SAID METALLIC TERMINALS, WHNE THE SLIDER IS SO MOVED, AND CAPPING MEANS FOR EACH END OF SAID TUBE.