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
Full Title - 'Mines and Quarries Form No. 11. Coal Mines Act, 1911. General Regulations as to the Installation and use of Electricity with Explanatory Memorandum.' Two 28-page booklets on off-white paper, held together with string, with black printed text. Loose inside a black leather hardback cover (with other coal mining regulations, bills etc) with the 'British Thomson-Houston Company / Electrical Engineering Manufacturers / Rugby' printed on it. Part I - 'the General Regulations as to the Installlation and use of Electricity', Part 2: 'Memorandum of the Regulations'
