Image from the Biodiversity Heritage Library.
Contributed by Yale Peabody Museum of Natural History.
| www.biodiversitylibrary.org
Transcription
TABLE I.—Tangents and External to a 1° Curve.
Chord=100 ft.
Int. Angle
Tangent
External
Int. Angle
Tangent
External
Int.
Angle
Tangent
External
106°
7603.5
3791.0
111°
8336.7
4386.1
116°
9169.4
5082.7
10'
7626.6
3809.4
10'
8362.7
4407.6
10'
9199.1
5107.9
20
7649.7
3827.9
20
8388.9
4429.2
20
9229.0
5133.3
30
7672.9
3846.5
30
8415.1
4450.9
30
9259.0
5158.8
40
7696.3
3865.2
40
8441.5
4472.7
40
9289.2
5184.5
50
7719.7
3884.0
50
8468.0
4494.6
50
9319.5
5210.3
107
7743.2
3902.9
112
8494.6
4516.6
117
9349.9
5236.2
10
7766.8
3921.9
10
8521.3
4538.8
10
9380.5
5262.3
20
7790.5
3940.9
20
8548.1
4561.1
20
9411.3
5288.6
30
7814.3
3960.1
30
8575.0
4583.4
30
9442.2
5315.0
40
7838.1
3979.4
40
8602.1
4606.0
40
9473.2
5341.5
50
7862.1
3998.7
50
8629.3
4628.6
50
9504.4
5368.2
108
7886.2
4018.2
113
8656.6
4651.3
118
9535.7
5395.1
10
7910.4
4037.8
10
8684.0
4674.2
10
9567.2
5422.1
20
7934.6
4057.4
20
8711.5
4697.2
20
9598.9
5449.2
30
7959.0
4077.2
30
8739.2
4720.3
30
9630.7
5476.5
40
7983.5
4097.1
40
8767.0
4743.6
40
9662.6
5504.0
50
8008.0
4117.0
50
8794.9
4766.9
50
9694.7
5531.7
109
8032.7
4137.1
114
8822.9
4790.4
119
9727.0
5559.4
10
8057.4
4157.3
10
8851.0
4814.1
10
9759.4
5587.4
20
8082.3
4177.5
20
8879.3
4837.8
20
9792.0
5615.5
30
8107.3
4197.9
30
8907.7
4861.7
30
9824.8
5643.8
40
8132.3
4218.4
40
8936.3
4885.7
40
9857.7
5672.3
50
8157.5
4239.0
50
8965.0
4909.9
50
9890.8
5700.9
110
8182.8
4259.7
115
8993.8
4934.1
120
9924.0
5729.7
10
8208.2
4280.5
10
9022.7
4958.6
10
9957.5
5758.6
20
8233.7
4301.4
20
9051.7
4983.1
20
9991.0
5787.7
30
8259.3
4322.4
30
9080.9
5007.8
30
10025.0
5817.0
40
8285.0
4343.6
40
9110.3
5032.6
40
10059.0
5846.5
50
8310.8
4364.8
50
9139.8
5057.6
50
10093.0
5876.1
Corrections to be Added (T=Tangent. E=External.)
Int.
Angle
Curve 5°
10°
15°
20°
25°
30°
35°
40°
45°
50°
55°
60°
65°
70°
100°
T=.43
E=.200
.86
.401
1.30
.604
1.74
.938
2.18
1.01
2.62
1.22
3.06
1.43
3.50
1.64
3.95
1.85
4.40
2.06
4.88
2.28
5.37
2.50
5.85
2.73
6.34
2.96
105°
T=.46
E=.230
.94
.470
1.42
.700
1.90
.938
2.38
1.17
2.87
1.42
3.34
1.65
3.84
1.90
4.35
2.14
4.84
2.39
5.35
2.64
5.87
2.90
6.40
3.16
6.93
3.41
110°
T=.50
E=.260
1.03
.535
1.55
.808
2.08
1.08
2.60
1.36
3.14
1.63
3.66
1.91
4.21
2.19
4.76
2.49
5.31
2.61
5.86
3.05
6.43
3.35
7.01
3.65
7.59
3.95
115°
T=.54
E=.307
1.13
.624
1.70
.939
2.29
1.26
2.86
1.57
3.45
1.89
4.03
2.21
4.63
2.54
5.23
2.87
5.83
3.20
6.44
3.53
7.07
3.88
7.70
4.23
8.35
4.58
120°
T=.61
E=.339
1.25
.720
1.89
1.08
2.52
1.45
3.16
1.82
3.81
2.20
4.44
2.56
5.11
2.95
5.78
3.33
6.44
3.72
7.11
4.10
7.80
4.50
8.51
4.91
9.21
5.32