so that the core is impregnated and jacketed at the same time 0031 fig2 gives comparative results for the wire rope described above with reference to similar ropes produced without any jacket and with a polypropylene jacket of the same thickness thus the applicant first prepared a u00be u2033 8 strand reverse iwrc wire rope such as shown in fig1 but without any jacket between the outer stands and the core two samples of such rope were subjected to a reverse bend fatigue test using a load of 1000 lbs 450 kg as shown in fig2 such non jacketed rope failed after just over 100 000 cycles then to improve this result a polypropylene jacket of 0 20 u2033 0 5 cm was used between the core and the outer strands surprisingly this construction produced essentially no improvement also as illustrated in fig2 since polypropylene did not produce improved results one would normally have expected that nylon which is often mentioned as an alternative to polypropylene in such cases would also be inadequate applicant had used nylon in other circumstances where it was found to act in a manner similar to polypropylene applicant has however decided to try to use nylon in this particular case to see if it would.