Notes On Building Construction Arranged to Meet the Requirements of the Syllabu
Notes On Building Construction Arranged to Meet the Requirements of the Syllabu
Henry Fidler
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304). It should be as free as possible from sulphur, phosphorus, or copper ; but a small percentage of manganese and of silicon improves it for the purpose. Foundry Pig, including all pigs having a fracture of a grey colour, con- taining a considerable proportion of free carbon, and being therefore adapted for the use of the ironfounder. This iron is produced when the furnace is at a high temperature and pro- perly provided with fuel. Forge Pig) consisting of those pigs which are almost free fr...om uncombined or graphitic carbon, and are therefore unfit for superior castings, being useful only for conversion into wrought iron. This description of iron occurs when the temperature is low, or the fuel insufficient, also when there is much sulphur in the ore or fuel. Forge iron is generally run from the blast furnace into iron moulds (instead of sand), by which it is kept free from the impurities of the sand, and also chilled, and thus rendered brittle and easy to break up for further treatment.
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