Casgliadau Arlein
Amgueddfa Cymru
Chwilio Uwch
Zinc ring in a blast furnace (technical drawing)
Hand drawn in black ink on pale blue, waxed paper. Technical drawing showing zinc ring in a blast furnace.
Nid yw sylwadau ar gael ar hyn o bryd. Ymddiheuriadau am yr anghyfleustra.