The use of wire rope prior to circa.1895 was rarely popular because of, in part, its lack of friction. It was also made of iron, rather than steel. Blondins were developed in the 1870's in the freestone quarries of Aberdeen. In 1886 only two off these quarries were so equiped. The introduction of steel, wire rope in about 1895 saw the wide spread adoption of the system, including in Wales. The Cwm Bychan example was probably part of a fraudulent mis-representation of the enterprise's worth.
See ISBN 1-86077-432-6