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STRENGTH OF MATERIALS. 231
Wrought Iron Pillars.
In important work, cast-iron pillars are rapidly going out of
use. Wrought iron pillars are now made which compare
favorably in price and are far more reliable than those of cast
iron. For full information regarding weight and strength of
wrought iron pillars and Z bar columns, see manufacturers’
catalogues.
Wooden Posts.
Table No. 29 was calculated by the formula
:
r 5000 X Area
Safe load = 0.1 X ) , / Z2
nnnA
I
1 + (^rX 0.004
and the result divided by 2240.
L = Length of post in inches.
D = Side of post in inches.
TABLE No. 29.—Safe Load in Tons on Square Pine or
Spruce Posts Having Square Ends Well Fitted.
(10 as Factor of Safety).
)!
Side of Post in Inches.
1 in. 2 in. 3 in. 4 in. 5 in. 6 in. 7 in. 8 in. 9 in. 10 in. 12 in.
1
2
3
4
5
6
7
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
38
40
0.1
0.0
0.0
4
6
1
|
1
0.7
0.5
0.3
0.3
0.1
0.1
8
6
9
2
9
4
1.89
1.59
1.27
0.99
0.77
0.60
0.49
0.39
0.27
3.45
3.12
2.70
2.27
1.8S
1.56
1.29
1.08
0.78
0.58
0.44
5.00
5.00
4.62
4.08
3.54
3.05
2.62
2.25
1.69
1.29
1.00
0.90
0.80
8.0
8.C
7.C
6.3
5.7
5.0
4.5
4.0
3.0
2.4
1.9
1.5
1.3
1.0
0.9
8
4
9
3
4
8
9
10.00
10.00
10.00
9.21
8.45
7.6S
6.94
6.24
5.03
4.06
3.31
2.73
2.27
1.92
1.63
1.41
1.22
12.50
12.50
12.50
12.50
11.21
10.80
9.91
9.08
7.53
6.25
5.19
4.34
3.66
3.11
2.66
2.31
2.01
1.78
1.56
16.00
16.00
16.00
16.00
15.35
14.35
13.41
12.44
10.58
8.96
7.57
6.43
5.49
4.72
4.17
3.55
3.11
2.68
2.38
2.18
1.96
20.00
20.00
20.00
20.00
19.51
18.44
17.40
16.32
14.18
12.22
10.50
9.04
7.80
6.76
5.89
5.17
4.56
4.05
3.56
3.23
2.91
2.64
2.39
30.00
30.00
30.00
30.00
29.22
28.10
26.87
25.50
22.95
20.40
18.02
15.88
14.00
12.36
10.95
9.73
8.6S
7.77
6.99
6.30
5.71
5.18
4.74
4.35
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