These cookies are absolutely essential for our website to function properly.
We use Google Analytics to measure how you use the website so we can improve it based on user needs.
These cookies may be set by third party websites and do things like measure how you view YouTube videos.
Amgueddfa Cymru – Museum Wales
The South Wales Electric Power Company map of extra high voltage wires owned by S.W.P. and those not owned by them but operated in conjunction with the S.W.P. system, not dated Scale : ½" to 1 mile
