The inside core structure and the outside mold had to withstand the pressure of about 30 tons of molten copper, and the casting had to be done in one continuous operation to prevent cracks or flaws.
فكان يجب ان يصمد قسمَا القالب الداخلي والخارجي امام ضغط النحاس الذائب الذي بلغ وزنه نحو ٣٠ طنا .‏