Casgliadau Arlein

Five graphs and a page of handwritten data attached with a paperclip. Graphs are hand drawn in black pen and in pencil on red lined graph paper. Graph paper of the English Steel Corporation Ltd., Sheffield. Graph 1: Moisture in Blast Furnace Gas Graph 2: Ferro-Phosphorous chart Graph 3: Ferro-Silicon chart Graph 4: Ferro-Manganese chart Graph 5: 540 ton charge - wt. of Swedish ore per charge Also a page of handwritten data re. Cwts of Fe Mn per ton of steel.