148 BULLETIN 42, UNITEI? STATES NATIONAL MUSEUM. 



The blastfurnaces have a capacity of prodaciug iron enough for 2,300 

 tons of rails per week, but the capacity of the steel and rolling mills is 

 greater, and by the addition of cupolas for independent renielting of 

 pig-iron the product can be brought up to 4,000 tons of rails. 



The collection was made by E. B. Kirby, e. m., and E. L. Zukoski, e. 

 M., in September, 1884. 



A large series of the ores smelted in blast furnace No. 5, nearly ail 

 of which are from the Lake Superior mines, together with the fluxes 

 and fuels, were taken September 9, 1884, and on the following day at 2 

 o'clock, when the metal was cast from the charges thej" 'represent, a 

 ladleful was selected and followed through the whole process, to the 

 rolling of the rail, and samples taken to represent each step. The ac- 

 tion of the blast furnace was regular and normal, and the pig-iron 

 smelted of the usual grade, and the operations throughout represent 

 the regular work of the plant. To these are added some general speci- 

 mens illustrating the process, together with a large series of the refrac- 

 tory materials used. 



The charge in the blast furnace for several weeks previous to taking 

 the samples was : 



Pounds. 



I'i barrows coke, each 525 pouuds 6, 300 



barj'ows limestone, each 525 poiiuds 3, 150 



1 barrow Angeline Hematite 700 



1 barrow Barnum 800 



1 barrow Cambria 900 



1 barrow Chapin .' 900 



1 barrow Cle vehiiid, specnhir 900 



1 barrow Cleveland, hematite 900 



1 barrow Ltidington 800 



1 barrow Michigamme 700 



2 barrows Pilot Knob, each 800 pouuds 1,600 



2 barrows Summit, each SOO pouuds 1, 600 



Converter spittings 223 



Steel scrap 84 



Old ingot molds 377 



Total 19,934 



Fifty-nine rounds of the above charge were introduced on the day 

 the samples were taken, making 371,700 pounds of fuel and 804,406 

 pouuds of ore, flux, etc.. charged. 



BLXai FURS A CE SPJECIMENH. 

 Ore. 



(1) Hematite. Cleveland Mine, Marquette County, Michigan. (54803.) 



(2) Hematite. Cleveland Mine, Marquette County, Michigan. (54793.) 



(3) Hematite. Angeline Miue, Marquette County, Michigan, (54798.) 



(4) Hematite. Barnum Mine, Marquette Couuty, Michigan, (54799.) 

 (^5) Hematite, Cambria Mine, Marquette Couuty, Michigau. (54794.) 



(6) Magnetite. Michigamme Mine, Marquette County, Michigan. (54801,) 



