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Full text of "Metallurgy Of Cast Iron"

278                       METALLURGY   OF   CAST   IRON.
having given very satisfactory results. The iron was melted with good Connellsville coke in a cupola after regular practice. This is a high-priced iron made by the Salisbury Carbonate Iron Co., one furnace being located at Chapinville, Conn. It is very evident by the extract seen below that the Salisbury and Muirkirk irons are rivals for the patronage of those making strong castings.
TABLE   55.—TENSILE  STRENGTH  TESTS  OF  HIGH   GRADE SALISBURY CARBONATE  IRON.
Heat Oct. istk, 1898.    Castings in weight from 500 to 18,000 Ibs. * Salisbury carbonate iron, No..4^.. ...........;»--;;;;•;;;;;;;—::::;:::}3«.8sotl».
Heat Oct. 21, ffyS.    Castings as above. *4 Salisbury carbonate iron, No. 4...................................... ) _„   „   ,-L
y2    -    '      »         » ' NO. 1, high......:......................................[35,320 ibs.
Heat Oct. 29, 1898.    Castings as above.
50 per cent Salisbury carbonate, No. 4       ........................................)
30       "              "                ".        No. 4. high.......................................[• 34,800 Ibs.
20       tl              ll                u          scrap      .........................................)
Obtaining strong iron from cupolas is a subject which interests many, and to have otheis' experience than the author we give space to an extract of an article published in the Iron Trade Review December 29, 1898, as follows: "It is probably not known to the trade .generally that Muirkirk pig iron was the first iron to be used successfully in the manufacture of gun iron castings for the United States Government, by melting in the cupola. Such, however, is the fact; and the credit of being able to make gun iron castings in the cupola that would stand the tests of the United States Government for gun carriage work rightfully belongs to Messrs. Robert Poole & Son Co. of Baltimore, Md., and Muirkirk pig iron made by me. This was in 1893. The War Department at first refused to accept cupola iron as gun iron, but when it was fully demonstrateduois Iron Co., Illinois Steel Co., Jefferson Iron Co., Kittan-ning Iron & Steel Co., C. A. Kelly Plow Co., Lebanon Furnace, Longdale Iron Co., Lackawanna Iron & Steel Co., Logan Iron........................   16,720     "                                     t-