W. G.

Number

Iron

In lbs. per sq foot.

Copper

In lbs. per sq. foot.

Brass

In lbs. per sq. foot.

1

12½

14

13½

2

11

13

12½

3

10½

12

11½

4

11

10½

5

10⅛

9⅝

6

8

94

9

7

8

8

6

7⅝

7⅛

9

7

10

5⅝

11

5

5

12

5

4⅝

13

3⅝

14

3 5/16

4

15

3

16

3

2⅞

17

2⅝

18

2

2⅛

19

2

l⅞

20

21

1 3/8

22

1 3/8

1 3/8

23

1⅛

1 3/16

1 3/16

24

1

1

1

25

0⅞

0⅞

0⅞

26

0 15/16

0½ 3/6

27

0 11/16

28

0⅝

0⅝

0⅝

29

0 9/16

0 9/16

0 9/16

30