The Artizan . The AsTrzAy.]Sept. 1,1885. J Magenta and its Derivative Colours, 203 formation of carbonic oxide as previously in the small furnace ; and hence arisesthe greater economy of fuel in the large furnace. To produce 300 tons of pi?iron per week, the large furnace requires to be supplied with 8,000 cubic feet ofblast per minute at a pressure of 31bs. per square inch. The accompanying woodcut, Fig. 1, is a vertical section of four furnaces atthe Ormesby Ironworks, Middlesborough, belonging to Messrs. Cochrane. Thesefurnaces were erected in 1855, and were the largest in the district at t
The Artizan . The AsTrzAy.]Sept. 1,1885. J Magenta and its Derivative Colours, 203 formation of carbonic oxide as previously in the small furnace ; and hence arisesthe greater economy of fuel in the large furnace. To produce 300 tons of pi?iron per week, the large furnace requires to be supplied with 8,000 cubic feet ofblast per minute at a pressure of 31bs. per square inch. The accompanying woodcut, Fig. 1, is a vertical section of four furnaces atthe Ormesby Ironworks, Middlesborough, belonging to Messrs. Cochrane. Thesefurnaces were erected in 1855, and were the largest in the district at that time;the boshes are 10ft. diameter, and the height is 56£ft. The furnaces are con-structed upon land consisting of mud and silt, and piling had therefore to beresorted to in order to secure a good foundation for the furnaces. A bed of con-crete was placed on the top of the piles, and six inverted arches were turned onthe top of the concrete, and the brick pillars carried up, and strong cast ironbearers fi
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