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Making the Strip Video Transcript

That was about seven hundred years ago but this is the twenty first century and there are so many children in the world these days, all demanding pocket money that another million new coins must now be struck. A nickel brass alloy is poured into the casting equipment where it is set solid between two slabs of water cooled graphite. This continuous moulding process produces an endless strip of metal, because of the heat the metal has reacted with oxygen in the atmosphere and has gone all black so tools like these are used to scrape the surface clean with the aid of a white lubricating fluid. The metal is still far too thick and so it must be squeezed between rollers working under enormous pressure. Precision rolling produces a strip that is exactly as thick as a pound coin should be wound up like a wash spring.