 Complete the following phrase:  For years, the works made barely enough money to cover the workmens wages. Then, in 1841, Alfreds brother Hermann invented the spoon-rollerwhich Alfred patented, bringing in enough money to enlarge the factory, steel production, and cast steel blocks. In 1847 Krupp made his first cannon of cast steel. At the Great Exhibition London of 1851, he exhibited a 6 pounder made entirely from cast steel, and a solid flawless ingot of steel weighing , more than twice as much as any previously cast. He surpassed this with a ingot for the 