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WEIGHT OF A LINEAL FOOT OF SQUARE AND ROUND BAR IRON IN POUNDS.

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Note. The elastic power or direct tension of bar iron medium quality per square inch of cross section equals 10 tons; and a bar is extended 000096, or nearly one ten-thousandth part of its length for every ton of direct strain per square inch of its sectional area: note, also, that either of the metals,-iron, tin, or zinc, at a red heat, possesses the property of decomposing water when in an aëriform state.

WEIGHT OF A LINEAL FOOT OF FLAT BAR IRON IN

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5.

4.58 5.72 6.87 8.02
4.79 5.98 7.18 8.38 9.58 10.78 11.97
6.26 7.50 8.75 10.00 11.25 12.50

9.16

10.31 11.45

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3

31 7.44 8.12 8.80 9.47
31/1 8.02 8.75 9.47
8.59 9.37 10.15
9.16 10.00 10.83 11.66 12.50 13.33

10-15

10.83

12.18

10.20 10-93

11.66

13.12

10.93

11.71 12.50

14.06

15.00

41 9.73 10.62 11.51 12.39 13.28 14.16
4 10-31 11.25 12.18
4 10-88 11.87 12.86

15.92

13.12 14.06 15.00

16.86

13.85 14.84 15.83

17.80

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17.18 18.74 20:30 21.86
18.32 20.00 21.76 23-32 25.00 26.66

23.42

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11222 R

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24

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2 10.40 11.44

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31 13.54 14.88 16.24

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3 14.58 16.04 17.50
3 15.62 17.18 18.74 21.86

16.66 18-32 20.00 23.32 26.66 33.32
21.24 25.78 28-32 35.40

20-40

23:32 | 29.16

25.00 31.24

44 17.70 19.46

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MECHANICAL TABLES

FOR THE USE OF OPERATIVE SMITHS, MILLWRIGHTS, AND

ENGINEERS.

The following Tables, originally dedicated to 'the National Association of the Forgers of Iron-Work,' are, with permission, added to the present edition: they will be found extremely useful to Smiths generally, and are accompanied by Observations and Practical Examples.

DIAMETERS AND CIRCUMFERENCES OF CIRCLES,

from One Inch to upwards of Twenty Feet, advancing by an Eighth.

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