TABLE XVII.

RISE PER MILE OF VARIOUS GRADES.

.61 .62 .63 .64 .65 .66 .67 .68 .69 • 70 •71 .72 • 73 .74 • 75 • 76 •77 • 78

INDEX.

Abbreviations explained
Acres, roods, and perches in square feet, Table VI.
Adjustment and use of instruments
Angles of frogs, to find .

index, to find
intersection, to find
plane ...
to read on verniers
tangential and deflection

of switch-rails.
Apex distance of curves, to find
Arc, functions of, to find
Arithmetical complement
Axemen, duties of
Azimuths of North Star, Table III.

PAGE

ix
152

23
129
69
55
12
43
50
130
52
13

6
84
150

Barometer, levelling by.
Bench-marks, proper intervals for
Bubble, to adjust on level

to adjust on transit

29
83
25
40

Chain, to lay out curves with
Chainman, duties of
Chief engineer, duties of
Chords, to calculate

Table XV.
Circle, propositions concerning
Circular arcs to radius of 1, Table VII.
Complement of an angle

arithmetical.
Compound curves. See Curves.
Contour maps, utility of
Correction for curvature and refraction in levelling
Cosines defined.
Crossings, plain rules for laying off
Cross-hairs, to adjust

eccentricity of
to put in new

63
82

79
54, 58
269

49
152
12
6

85
28
12

139
24, 26, 40

24
44

319

.

PAGE
Cross-sectioning. See Slope stakes.
Cubes and cube roots of numbers, Table XI. .

161
Curves, circular, on railroad defined

51
to find radius, length, degree, apex distance, chord, versed sine,
and external secant

52, 56
form for field notes

70
Curves, how to lay out on the ground, -
with the chain only

63
with transit and chain

66
hints as to field-work

82
protractor for

84
slackening grade on .

87
terminal

88
Curves, simple, location of, -
how to proceed when the P. C. is inaccessible

93
to shift the P. C. in order to strike a fixed tangent .

96
to change radius from same P. C. in order to strike a fixed tan.
gent

97
to triangulate on

94
to pass through a fixed point

127, 128
Curves, compound,-
how to proceed when the P. C. C. is inaccessible

95
to compound a curve in order to strike a fixed tangent

98
to shift a P. C. C. in order to strike a fixed tangent

99
summary of rules for

101
to compound into a tangent intersecting main curve on concave
side

102
to compound into a tangent intersecting main curve on convex
side

103
Curves, reversed, -
parallel tangents, radii equal

115
parallel tangents, radii unequal

117
angles unequal, radii equal

119
angles unequal, tangent points fixed, radii equal

120
divergent tangents, radii equal, advancing towards intersection 123
receding from intersection

124
to shift a P. R. C. in order to strike a fixed tangent

125
Curves, miscellaneous,
elevation of outer rail

141, 142
degree of, to find by calculation

52, 55
to find on ground

145, 146
to connect curves of contrary flexure by short tangents

89
to locate a Y from a tangent.

103
from a convex curve

104
from a concave curve

106
to locate a tangent to a curve from a fixed point

108
to two curves already located
to substitute a curve for a tangent connecting two curves

109

.

109