5. A wire rope guide that provides "a best fit" on a rope should be 

 used; a tight fit is better than a loose fit. 



6. The accuracy of LMA readings for the Magnograph unit is outside the 

 manufacturer's specifications; however, a new method has been developed 

 by the manufacturer to improve the accuracy. New equipment will have a 

 self-calibrating capability; NCEL's equipment can be manually calibrated. 

 This method brings the LMA readings well within the manufacturer's 

 specifications . 



CONCLUSIONS 



1. Broken wires with a small gap between the ends do not always produce 

 an LF signal of sufficient size to be distinguished from background-noise 

 signals. 



2. At the present time, the Magnograph unit should be used as an inspec- 

 tion tool to augment the inspector's skills. It is valuable because the 

 internal condition of wire ropes, particularly broken wires and corrosion, 

 can be detected. 



3. The Magnograph equipment provides considerably more technical data 

 on the rope's condition than is available by using visual inspection and 

 will indicate areas that require further inspection. 



