Engineering Materials
Admiralty gun metal contains

Iron scrap and zinc
63 to 67% nickel and 30% copper
Alloy of tin, lead and cadmium
88% copper, 10% tin and rest zinc

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Engineering Materials
The brown smoke during the operation of a Bessemer converter indicates that the

Air is burning out silicon and manganese
Silicon and manganese has burnt and carbon has started oxidizing
The converter must be titled to remove the contents of the converter
The brown smoke does not occur during the operation of a Bessemer converter

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