WROUGHT IRON.
450
GENERAL SUMMARY.
COMMON REFINED IRON.
No. of test.	Primitive elastic limit per square inch.	Overstraining load per square inch.	Permanent set.	Interval of rest.	Secondary elastic limit per square inch.	Gain per square inch.	Tensile strength per square inch.	Elonga- tion,	Contraction of area.
7407 a 7411	Pounds. 31,000 27,800	Pounds.	Per cent.	Days.	Pounds.	Pounds.	Pounds. 48,220	Per cent. 19.	Per cent. 32.1
		30,000	.731	1	30,000	0	43,020	9.6	21.5
7414	34.000	35,000	1.890	1	38,000	3,000	50,800	22.4	36.4
7412	35,500	40,000	3.0	1	43,500	3,500	53,930	22.7	36.4
7413	35,400	45,000	6.6	1	49,500	4,500	53,000	19.6	33.5
7427	31,600	35,000	2.254	7	39,000	4,000	51,600	15.8	26.1
7428	33,000	40,000	4.1	8	46,500	6,500	54,800	22.1	36.4
7429	35,000	45,000	5.8	8	50,000	5,000	57,400	19.3	29.1
BEST PUDDLED IRON.
7408 7415	32,600 30,800						48,300 49,600	27.	36.4
		35,000	2.8	1	37,000	2,000		18.9	36.4
7416	31,000	40,000	5.0	1	44,000	4,000	50,900	15.5	29.1
7417	30,000	45,000	9.3	1	49,500	4,500	51,000	10.9	33.5
7430	32,700	35,000	2.4	8	40,500	5,500	53,200	22.5	40.6
7431	32,000	40,000	5.1	8	46,000	6,000	53,600	15.6	33.5
7432	30,000	45,000	9.9	8	51,000	6,000	55,000	16.1	19.9
BURDEN’S BEST IRON.
							48,000	27.3	39.2
7418	29,000	30,000	2» 030	1	32,500	2,500	47,700	27.	43.3
7419	29,600	35,000	3.7	1	38,000	3,000	48,100	28.5	44.6
7420	29,400	40,000	6.1	1	44,000	4,000	48,920	27.8	41.9
7433	29,500	30,000	2.078	7	34,700	4,700	48,560	425.9	47.2
7434	29,300	35,000	3.7	7	39,000	4,000	49,560	25.8	43.3
7435	29,400	40,000	7.0	7	45,500	5,500	50,500	24.4	49.7
7436	27,000	30,000	1.857	50	34,000	4,000	49,900	25.	43.3
7437	29,100	35,000	4.0	50	40,000	5,000	51,400	25.8	47.2
7438	28,000	40,000	6.7	51	46,000	6,000	52,800	25.2	44.6
NORWAY IRON.
							41,800	36.3	71.7
7421	<20,000	25,000	2.8	1	29,500	4,500	42,520	33.7	70.8
7422	25,000	30,000	4.8	1	34,500	4,500	44,000	35.7	71.7
7423	21,700	35,000	■ 8.0	1	40,000	5,000	44,900	32.0	67.8
7424	22,800	־25,000	2.9	7	29,500	4,500	44,640	32.4	66.8
7425	19,600	30,000	4.5	7	35,500	5,500	46,500	31.3	66.8
7426	25,000	35,000	8.0	7	40,500	5,500	48,480	30.0	68.8
a Defective specimen.