WEIGHT OF RAILS ANI> CHAIRS.
191
Table of the Properties of different Kinds of Timber,
Kind of Wood. dry.
AverageWeightof aCubicFoot.
Weight of theModulus ofElasticity, inlbs. per SquareInch.
CohesiveForce, inlbs. perSquareInch.
Valuesof theCon-stant or
C.
Comparative Stiff-ness, Strength,Resilience, Oakbeing 100.
Common oak
AO lbs.
1,714,500
11,880
710
100
100
100
lliga do..
46
i,610,496
12,888
714
93
108
125
Dantzie do..
47
1,998,000
12,780
117
1»7
99
Ameruan do. .
42
1,958,700
10,253
114
86
64
Beech
40
1,316,000
12,225
G77
77
H >3
138
Alder .
40
1,086,750
9,540
530
63
80
101
Plane
40
1,343,250
10,935
607
7«
92
108
Sycamore
38
1,036,000
9,630
535
59
8i
111
Chestnut
47
1,147,500
10,656
610
67
89
118
Ash
40
1,525,500
14,130
656
89
119
160
Elm
44
1,343,000
1,687,500
9,720
540
78
82
86
Acacia
51
15,860
022
98
95
92
Mahogany* Spanish
45
1,255,500
7,560
425
73
67
61
— Honduras
35
1,593,000
11,475
637
93
96
99
Walnut
43
1,432,000
8,800
500
40
74
111
Teak
4G
2,167,074
32,915
717
126
109*
94
Poona
40
1,689,800
12,350
590
99
l(/4
82
Turtosa, or African
59
1,728,000
17,200
101
144
138
oak.
Poplar
33
763,000
5,920
327
44
50
57
Abele
32
1,134,000
10,260
570
66
86
112
Cedar of Libanus .
34
486,000
7,420
412
28
G2
106
Rica fir
30
1,687,500
9,540
530
98
80
64
Memel do.
34
1,957,750
9,540
545
114
80
56
Mar Forest do.
38
845,066
7,323
315
49
61
76
Scotch do.
33
951,750
7,H0
582
55
60
65
Christiana whitedeal.
American white
29
1,804,000
12,346
686
104
104
104
29
1,244,000
10,296
570
72
86
102
Spruce.
Weymouth, or vel-
28
1,633,500
11,835
058
95-
99
103
low pine.
Pitch pine
58
1,252,200
9,796
560
73
82
92
Larch
81
1,363,500
12,240
557
79
103
134
Courie
36
1,982,400
10,960
610
116
92
74
Table showing the Weights of Rails and Chairs requisite for fowling aMile of Railway on Four Lines t accordingly as the Bars are supportedat greater or less Distances.
1
| Length of bearing,
in feet and inches.
| Length of rail, in ft.
Weight of rail, in
1 lbs.
i
Number of rails infour lines, per mile, j
Weight of rail, permile, in tons.
Number of jointchairs, per mile.
Weight of jointchairs and pins, per
1 mile, in tons.
Number of interme-diate chairs,permile.
Weight of interme-diate chairs and pinslper mile, in tons, j
Total weight of;
, chairs and pins, per.
mile, in tons. |
3 0
15
257
1408
161
1408
171
5632
60*
78
3 9
15
294
1408
185
1408
19
4224
47±
66i
4 0
16
326
1320
192
1320
171
3960
44i
62
5 0
15
337
1408
212
1408
203
2816
34
54|
6 0
22
316
1760
248
1760
26
1760
21i
474