Side
af
764
Forrige
Næste
214 moleswobth’s pocket-book
Elevation of Outer Kail on Curves
Let D = Diameter of carriage wheels in feet.
W = Width of gauge in feet.
P — Lateral play between flange and rail in ft.
— — Ratio of inclination of tire.
N
V = Velocity in miles per hour.
R — Radius of curve in feet.
E = Elevation of outer rail in inches.
[-782 V2(NDW)]-4PR.
E — — ~ —- — * ’ *
NDR
ANOTHER RULE.
V2 • ,
w------- = Elevation of outer rail in. inches.
125R
Speed Table fok Trains.
Time of perform-
ing
* mi.U mi.jlmile.
Time of perform- ' _ fa
______iu< fa
i mi.!; mi.ll mi. I “ g,
miles :
5
6
7
8
9
10
12
13
14
15 jl
16
17
18
19
20
21
22
23
m. B.im
3 0 6
2 30|i
2 81'
1 52;
1 40 3
1 30 3
1 2(2
1 15,2
1 9 2
42
0 2
0 56 1
0 53 1
0 50 1
0 47 1
0 45 1
0 42 1
0 40 1
0 39 1
4
3
0 12
0 10
8
17
45
20
0,
43
30
18|
81
0
52,
46
40
6
5
5
4
4
4
3
3
0
0
30
40
0
27
0
37
ol
45
31
& 20
3
3
2
2
miles
24
25
26
27 I
28
29
30
31
32
33
0 371
0 36 1
0 34 1
0 33'1
0 32 1
30
25
21
18, .2
35
36
37
38
39 I
40 )(
41 I
36|| 42
9
0
51
0 30 1
-0 29 0
0 28 0
0 27 0
0 26 0
0 25 0
0 25 0
0 24 0
lO 23 0
.0 23 0
|0 22 0
!o 21 0
0 21 0
15 2
122
9 2
62
4 2
2 2
ol
58
66
54
53
51 1
50 1
48’1
47 1
46 1
45 1
43 1
42 1
m. s. miles
30!|
24
18 !
13
8
4
0
56
52
49
46
43
2
43
44
45
46
47
48
49
50
51
52
53
54
40 55
37 56
34 67
—" 58
59
60
32
30
27
25
Time of perform- ing
i Emi. 1 mi.
m. s. 0 20 0 20 Ü 20 0 19 0 19 0 18 0 18 0 18 0 17 0 17 0 17 0 16 0 16 0 16 0 15 0 15 0 15 0 15 m. s. m. s. 0 4111 23 0 40 1 21 0 4.011 20 0 39 1 18 0 38'1 16 0 37 1 15 0 36 1 13 0 36 1 12 0 351 10 0 34 1 9 0 34 1 7 0 33 1 6 0 32 1 5 0 32 1 4 0 311 3 0 31,1 2 0 30 1 1 0 30 1 0