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PHYSICAL TESTS FOR THE BLAST FURNACE, ETC. 497
TAHLE 105.— PHYSICAL TESTS OF FURNACE IRON TAKEN JANUARY
No. of Test, Contraction. Deflection. Strength Fluidity. Chill. Diam'ter of Bar. Strength per sq. in.
L Inch. 6-64 Inch. O.I2 Pounds. 2,300 Inches. 41A Not taken. Inch. 1.194 Pounds. 2,054
TABLE IO6.—PHYSICAL TESTS OF CUPOLA-IRON.
No. of Test. Contraction. Deflection. Strength Fluidity. Chill. Diam'ter ' of Bar. Strength per sq. in.
2 Inch. 8-64 Inch. 0,08 Pounds. 3,220 Inches, 5 Not taken. Inch, 1.242 Pounds. 1,907
TABLE IO7. ANALYSIS OF FURNACE-IRON. ANALYSIS OF CUPOLA-IRON.
Silicon. Sulphur. Silicon. Sulphur.,
Per cent. i. 02 Per cent. 0.034 Per cent. 0.81 Per cent. 0.056
NOTK.—The number of inches given under "fluidity" in this record is directly measured on the fluidity strip, seen at S, in Figs. 121 and 122, pages 509 and 514.
The day is past for tolerating; the blind, ignorant practice which we fotindrymen followed up to about 1890 in mixing- iron. The wonder is that we ever 11 hit " what we wanted, when we consider how deceptive is the fracture of pig metal as a guide to its true " grade." I am aware that up to 1900 a little over half our founders kept up with the progress of utilizing chemistry in mixing their iron; nevertheless, I say, when the furnaceman has done his part, let the founder study to do his by calling chemistry to his aid, or else get out of the business and stop complaining about "bad iron." There is no " bad iron" in the sense some have inferred. All can be utilized in some classemen tested their own iron by remelting it in a cupola and kept a regular record of all their tests, it would have a great tendency to make many investigate thoroughly to find whether the fault was not their own before entering complaints to the furnacemen.practice, inudi better with round bars than with square »»nis.burs..........................*fi$7 "