Indicator for low permeability materials

Claim 1

IN A MAGNETIC PERMEABILITY INDICATOR, A SUPPORTING STRUCTURE HAVING THEREON A PAIR OF PIVOT BEARINGS OPPOSITELY DISPOSED AND ARRANGED FOR SUPPORTING A SHAFT ROTATABLY ABOUT AN AXIS, AN ELONGATED ARM SUSPENDED FOR ROTATION ABOUT SAID AXIS, A PERMANENT MAGNET MOUNTED ON ONE END OF SAID ARM WITH A MAJOR MAGNETIC AXIS TANGENT TO THE ARC OF SAID ROTATION OF SAID END OF THE ARM AND HAVING REGULARLY CURVED MAGNET ENDS OF UNIFORM RADIUS OF CURVATURE, MEANS BALANCING SAID ARM WHEREBY EQUAL FORCES ARE REQUIRED TO MOVE SAID MAGNET IN EITHER DIRECTION ALONG SAID AXIS THEREOF; A PAIR OF MEMBERS MADE OF MAGNETIC MATERIAL, ONE OF SAID MEMBERS COMPRISING AN ANVIL OF KNOWN PERMEABILITY FIXEDLY SUPPORTED ON SAID SUPPORTING STRUCTURE, THE OTHER MEMBER BEING OF UNKNOWN PERMEABILITY AND MOVABLE RELATIVE TO SAID SUPPORTING STRUCTURE; ONE END OF SAID MAGNET BEING ADAPTED TO CONTACT SAID ANVIL, SAID MEMBER OF UNKNOWN PERMEABILITY BEING ADAPTED TO BE MOVED INTO CONTACT WITH THE OPPOSITE END OF MAGNET AND AWAY THEREFROM, WHEREBY THE MAGNET WILL ADHERE TO THE MEMBER OF GREATER PERMEABILITY, THEREBY PROVIDING MEANS FOR INDICATING WHICH OF THE TWO MAGNETIC MEMBERS HAS THE GREATER PERMEABILITY.