Ultimate or breaking tensile stress per sq.

inch.

Elastic limit in tension.

Contraction of area per cent.

Elongation per cent.

C. Bessemer steel (average of different qualities for tyres, axles, and rails)

Tons.

Tons.

C. Hammered

33 9

22.2

46.9

12.0

C. Rolled ...

320

19.0

36.1

18.0

C. Crucible steel (average of different qualities for tyres, axles, and rails)

C. Hammered..

38.2

21.9

22.8

7.0

Rolled (for axles) ...

30.6

18.7

10.1

10.6

C. Bessemer steel, tyres and axles..

33.7

C. Crucible cast-steel from Swedish bar-iron, chisel temper..

52.8

26.0

..

5.3

C1Crucible cast-steel, rolled

34.3

20.5

..

2.0

C1 „ „ hammered

37.05

25.0

..

13.5

C1Cast-steel, piston rods .

33.7

26.75

..

0.9

C. Experiments on Steel by a Committee of Civil Engineers, 1868. The bars experimented upon were turned down from 2-inch square bars to a diameter of l.382 = l1/2 square inch.

C1 Further experiments of the same Committee results, bound up with the report just quoted.

1 Works in Iron.