Rhondda coal = Cardiff Penarth gold.

The source of energy and the impetus for the growth of the export coal market. Resentment to the riches of the people living near the coast was commonplace then and was expressed even I was an apprentice in the 1960's. [011] 

Penrhiw Colliery, with its wooden head-frame, the last in Wales! Wood was superceded by structures formed from rolled steel joists (R.S.J's.) and of riveted construction toward the end of the nineteenth century. [025]