(Original.) Chains of superior iron will require ¼ to 1/3 more to break them.

Diam. of rod of which the links are made.

Weight of chain per ft. run.

Breaking strain of the chain.

Ins.

Pds.

Pds.

Tons.

3/16

•325

1,731

•773

½

•579

3,069

1.37

7/16

.904

4,794

214

3/8

1.30

6,922

3.09

7/16

1.78

9,408

4.20

½

2.31

12,820

5.60

9/16

2.93

15,590

6.96

5/8

3.62

19,219

8.58

11/16

4.38

23,274

10.39

¾

5.21

27,687

12.36

13/16

611

32,301

14.42

7/8

7.10

87,632

16.80

15/16

8.14

43,277

19.32

Diam. of rod of which the links art made

Weight of chain per ft. run.

Breaking strain of the chain.

Ins.

Pds.

Pds.

Tons.

3/16

9.26

49,280

2200

1 1/8

11.7

69,226

26.44

1¼

14.5

73,114

32 64

1 3/8

17.5

88,801

39.42

1½

20.8

106,280

47.00

1 5/8

24.4

123,614

55.14

1¾

28.4

143,293

63.97

1 7/8

32.6

164,605

73.44

2

37.0

187,162

83.55

2¼

46.9

224,448

100.2

2½

57.9

277,088

123.7

2¾

700

335,328

149.7

3

83.3

398,944

1781

* Price in 1873 of chains, about 10 cents per pound for 3/8; 7¼ for 3/8; 6 for 7/8; 5½ for 1 1/8