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PURCHASE   AND   SAMPLING   OF   PIG   IRON.
I99
from 1.30 to 2.00 per cent, of silicon and from .020 to . 040 in sulphur. We have an arrangement for our office in which a record of the chemical and physical qualities obtained in our castings can be recorded. This enables us to work intelligently when wishing to refer to past results or experiences in repeating old or making new mixtures of iron. These records are also kept in such_a manner as to show the loss in silicon and increase in sulphur, etc., in our heats, something which is very essential to be understood, and is treated in Chapter XLY.
TABLE 28.—PHYSICAL TESTS OF   "HEAT"   TAKEN   SEPTEMBER 14,   1896.
5 a bo		a o	d	.5		03 ^.n	s.-3
e~< a 0 a JJ ?s«	1	1 a	.° o ..s	£ w> 3*	jj	|! «Cn 03  Q	5*3
o «	s	3	p	ft--	a	P	02
I	2/8"	-135"	.140"	i,955	864"	I.I43"	1,907
2	2fs"	.130"	.no"	1,625	6 64"	I.I36"	1,604
3	Il<»	.128"	.120"	1,520	5-64"	I.I30"	I.5I5
4	2&"	.124"	-150"	1,495	4-64"	I.I42"	1,459
REMARKS,
The four test bars showed a perfect, solid fracture.   The strongest test bar was the last cast and the weakest bar at the second pouring.
[Signature of Tester.]         THOS. D. WEST.
TABLE 2Q.—CHEMICAL ANALYSIS  OF  STRONGEST TEST BAR.
Silicon.	Sulphur.	Combined Carbon.	Graphitic Carbon.	Phosphorus.	Manganese.
i. 20	.079	.094	2.67	.089	0.40
CHEMICAL ANALYSIS  OF WEAKEST TEST BAR.
Silicon.	Sulphur.-	Combined Carbon.	Graphitic Carbon.	Phosphorus.	Manganese.
2.15	.060	•79	2-75	.091	-37
[Signature of Chemist.]      D. K. SMITH.cal analysis and an examination of the castings. The tests given in Tables 28 and 29 were obtained from four round test bars cast on end at about equal divisions of the heat. The mixture for the heat here recorded was all pig iron, excepting about 5 per cent, shop scrap, the pig rangingan-