Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
TABLE VIII. MIDDLE ORDINATES OF RAILS
Length of Rail (feet)
C o / R Feet 30 Inch 28 Inch 26 Inch 24 Inch 22 Inch 20 Inch C o R Feet 30 Inch 28 Inch 26 Inch 24 Inch 22 Inch 20 Inch
0-20 17189 .08 .07 .06 .05 .04 .03 8 716.8 1.88 1.64 1.42 1.20 1.01 .84
0-40 8594 .16 .14 .12 .10 .08 .07 9 637.3 2.12 1.84 1.60 1.35 1.14 .94
1-0 5730 .24 .20 .18 .15 .13 .10 10 573.7 2.36 2.05 1.78 1.50 1.27 1.04
1-20 4297 .31 .27 .23 .20 .17 .13 11 521.7 2.59 2.26 1.95 1.65 1.39 1.15
1-40 3438 .39 .34 .29 .25 .21 .17 12 478.3 3.83 2.47 2.15 1.81 1.54 1.26
2-0 2865 .47 .41 .35 .30 .25 .20 13 441.7 3.05 2.66 2.30 1.96 1.66 1.36
2-20 2456 .55 .48 .41 .35 .29 .23 14 410.3 3.30 2.87 2.48 2.10 1.78 1.46
2-40 2149 .63 .55 .47 .40 .33 .27 15 383.1 3.54 3.08 2.68 2.26 1.91 1.57
3-0 1910 .71 .62 .53 .45 .38 .31 16 359.3 3.76 3.28 2.83 2.40 2.04 1.67
3-20 1719 .78 .68 .59 .50 .42 .35 17 338.3 4.00 3.48 3.02 2.57 2.16 1.78
3-40 1563 .86 .75 .65 .55 .46 .38 18 319.6 4.21 3.67 3.18 2.70 2.28 1.87
4-0 1433 .94 .82 .71 .60 .50 .42 19 302.9 4.45 3.89 3.36 2.86 2.41 1.98
4-20 1323 1.02 .89 .77 .65 .55 .45 20 287.9 4.70 4.09 3.55 3.00 2.54 2.09
4-40 1228 1.10 .96 .83 .70 .59 .48 22 262.0 5.16 4.44 3.84 3.30 2.80 2.29
5 1146 1.18 1.03 .89 .75 .63 .52 24 240.5 5.64 4.92 4.20 3.59 3.04 2.50
6 955.3 1.41 1.23 1.06 .90 .76 .62 26 222.3 6.07 5.29 4.58 3.88 3.29 2.70
7 819.0 1.65 1.44 1.24 1.05 .89 .73
TABLE IX. SHORT RADIUS CURVES
Radius Feet Chord Feet Central Angle Deflection Angle Deflection for 1 Foot
35 10 16-26 8-13 49.3
45 10 12-46 6-23 38.3
50 15 17-16 8-38 34.5
60 15 14-22 7-11 28.8
75 15 11-30 5-45 23.0
100 20 11-30 5-45 17.3
120 20 9-34 4-47 14.3
150 20 7-39 3-49 11.5
190 25 7-32 3-46 9.15
200 25 7-10 3-35 8.6
225 25 6-25 3-12 7.7
240 25 5-58 2-59 7.2
250 25 5-44 2-52 6.9
275 25 5-12 2-36 6.2
288 50 9-58 4-59 6.0
300 50 9-32 4-46 5.7
350 50 8-12 4-06 4.9
376 50 7-40 3-50 4.6
400 50 7-10 3-35 4.3
410 50 7-00 3-30 4.2
To find length of curve divide angle from P. C. to P. T. by central angle of chord,
and multiply by length of chord.