Mae'r cwcis hyn yn gwbl angenrheidiol ar gyfer weithrediad y wefan.
Rydym yn defnyddio Google Analytics i fesur sut ydych yn defnyddio'r wefan er mwyn i ni ei wella yn seiliedig ar angen defnyddwyr.
Gall y cwcis hyn gael eu gosod gan wefannau trydydd parti a gwneud pethau fel mesur sut rydych yn gwylio fideos YouTube.
Amgueddfa Cymru
A cream coloured A4 file containing notes and diagrams relating to the Rotary Converter e.g. notes on working principles of a Rotary Converter. The notes and diagrams were produced by Mr Elfyn Jones-Roberts and Mr Kevin Cunnington, both of whom were mine electricians at Llechwedd. The file also contains details of maintenance work carried out on the Rotary Converter by Fletcher Langley Limited (electrical and mechanical engineers), Morganite Electrical Carbon Limited, and the Associated Power Services (South Western) Ltd.
