A Treatise on Surveying, Comprising the Theory and the Practice, Volume 2

Front Cover
D. Appleton, 1897 - Surveying
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Contents

Iced bar apparatus
73
ARTICLE IAOI 628 Cutoff cylinder
76
Method of measurement
77
Computation formulas
78
Standardization of B
79
Duplex base apparatus
81
Accuracy obtainable in base meas urements
84
Degree of accuracy necesaary
85
Reducing the bane to the level of the sea
86
To interpolate a base
87
Eccentric reduction
89
Reduction of horizontal direction to sea level
90
Final adjustment
91
Local or station adjustments
92
Number of local equations at a station
93
Local adjustment for directions
96
General or figure adjustment
101
47 Number of angle equations in a net
103
Definitions
137
Spheroid coordinates 188
139
Declination and hour angle in terms of altitude and azimuth
140
Hour angle azimuth and zenith distance of a star at elongation
141
Precession
142
The aberration of the fixed stars
143
Apparent place of stars
144
Parallax
145
The dip of the horizon
146
Sidereal and solar days
147
Relation of apparent and mean time
148
The transit
156
The meridian telescope
158
To make the lines vertical
161
Mothod of observation and selec tion of stars
163
Record
165
Pivot inequality
166
Value of level division
168
Computation of chronometer cor rection
170
Collimation correction
171
Azimuth correction
172
Definitions
176
By transporting chronometers
177
By exchange of terrestrial signals
179
ARTICLE PAGE 702 By celestial signals
180
The chronograph
181
Personal equation
183
Adjustment of discrepancies
184
First methodBy meridian alti tudes or zenith distances
185
Third methodBy single alti tude at a given time
186
Fourth methodTo reduce an al titude observed at a given time to the meridian
188
Fifth methodBy reduction of circummeridian altitude
189
Sixth methodBy the pole star
191
The instrument 1921 ARTICLE PAOE 715 Adjustment of the zenith tele scope
194
Precision
195
Directions for observing
196
Determination of the value of one division of the micrometer
197
Computation general expression for latitude
200
Correction for refraction
201
Form for computation
202

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Page 398 - All buoys along the coast, or in bays, harbors, sounds, or channels, shall be colored and numbered, so that passing up the coast or sound, or entering the bay, harbor, or channel, red buoys with even numbers shall be passed on the starboard hand, black buoys with uneven numbers on the port hand, and buoys with red and black stripes on either hand. Buoys in channel-ways shall be colored with alternate white and black perpendicular stripes.
Page 339 - Rule 2. — When the point sought is without the great circle it is always on the same side of the line from the most distant point as the intersection of the other two lines.
Page 22 - If we now add 8 feet to tripod and 8 feet to signal-pole, the visual ray would certainly pass 6 feet above the tangent point, and 20 feet of the pole would be visible from A. II. Elevations required at given distances. — If it is desired to ascertain whether two points in the reconnaissance, estimated to be 44 miles apart, would be visible one from the other, the natural elevations must be at least 278 feet above mean tide, or one 230 feet, and the other 331 feet, etc. This supposes that the intervening...
Page 147 - A sidereal day is the interval between two successive transits of the vernal equinox over the same meridian. It is 3...
Page 68 - ... when the index reads greater than zero and plus when it reads less. Let R be the reading of the index when the balance is suspended by its hook, hook end up. Let W be the total weight of the balance found by weighing it on another balance. Then if...
Page 336 - BŁ, intersecting at d; through d draw a line directed to C. Then set up at C, and assuming the point c on the line dC, at an estimated distance from d, and putting the table in a position parallel to that which is occupied at D, by means of...
Page 280 - D' ^~ to be applied to the approximate altitude for the decrease of gravity on a vertical acting on the density of the mercurial column. It is always additive.
Page 279 - Z = the difference of level between the two barometers ; L = the mean latitude between the two stations ; H= the height of the barometer at the upper station reduced to the temperature of the barometer at the lower station ; or, H= h...
Page 335 - The opposite angles of the quadrilateral adce being supplementary, angle ace and angle ode are subtended by the same chord ae and cae and cde are subtended by the same chord ce ; consequently, the intersection of ae and ce at e must fall on the line db ; or, the segments of two intersecting chords in a circle being reciprocally proportional, the triangles adf and cef are similar, and the triangles cdf and aef...

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