637
METAL PROM ROTATING SHAFTS,
No. 7380.
Marks, 1 C 2.
Endurance test No. 304. See Report 1899, p. 855. Diameter, ".564.
Sectional area, .25 square inch.
Gauged length, 3".
Applied loads per square inch.	Elongation per inch.	Successive elongation per inch.	Permanent set.	Successive permanent set.	Remarks.
Pounds. 1,000 5,000 10,000	Inch. 0. .000067 .000300 .000633 .000967 . 001333 . 001500 . 028667 .032167 .034000 .038000 .045833 .053 .063 .080 .097 .127 .193	Inch. 0. .000067 .000233 .000333 . 000334 .000366 .000167 .027167 .003500 .001833 .004000 .007833 .007 .010 .017 .017 .030 .066	Inch. 0. 0.	Inch. 0. 0.	Initial load.
					
30.000 40.000					
			0.	0.	Elastic limit.
45,000					
					
47.000 48.000 50.000 52.000					
					
					
					
					
56.000 58.000 60.000 62,000					
					
					
					Tensile strength.
					
........pounds.. 62,000
............do... 44,000
...........inch.. .3833
............do... .001500
............do...	.214
................. 61.5
at the middle of the stem ... fine silky, cup-shaped
22.״ ,*56.״ 22.״........
General summary.
Tensile strength per square inch of original section...
Elastic limit per square inch of original section......
Elongation per inch after rupture..........;...........
Elongation per inch under strain at elastic limit......
Reduction in diameter at point of rupture..- • - • — •: —
Reduction in area after rupture, per cent of original section.
Position of rupture....................................
Character of broken surface............................
Elongation of inch sections............................ • • •