A wire rope tester which can detect broken wires, area reductions, or wire contact irregularities. The tester includes two permanent magnetic stacks which produce axial adjacent and opposed DC magnetic fields which magnetize the rope. Broken wires are indicated by flux variations when the flux density...http://www.google.ca/patents/US4827215?utm_source=gb-gplus-sharePatent US4827215 - Method of and apparatus for magnetic saturation testing a wire rope for defects
