# Text Book of Topographical and Geographical Surveying

H.M. Stationery Office, 1905 - Surveying - 288 pages

### Contents

 Frontispiece Tree Station Sierra Leone Triangulation 9 III 11 Subtense Methods and Tacheometry 51 PlaneTabling 56 Example of SmallScale PlaneTable Work in Undulating Country Kroonstad 56 Survey under Active Service Conditions 63 Levelling 74 Dumpy Level 78
 XV 140 Latitudes and Azimuths 182 Longitude 184 Theory of Errors as applied to Topographical Work 29 CONTENTS 204 a 208 39 212 118 218 Parallel 246

 Heights Barometer and Hypsometer X Contouring and Hill Sketching 89 Water Level Ordnance Survey Pattern 90 Map Projections and Graticules 92 Ordnance Survey 1inch black with brown hills 96 Clarkes Perspective Projection 104 Conical Projection with Rectified Meridians 108 Reproduction of Maps in the Field 112 British and Foreign Government Maps and Surveys 118 XVIII 118 Field Astronomy 123
 Spherical Excess 258 Astronomical Refraction 259 Parallax of the 261 End of Book 270 Explanation of Table I 283 92 284 112 285 184 286 275 287 282 288

### Popular passages

Page 122 - Each planet moves in its orbit at such a speed that a line joining it to the sun sweeps over equal areas in equal times. 3. The square of the time...
Page 37 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.
Page 129 - The mean solar day is divided into 24 hours, each hour into 60 minutes, and each minute into 60 seconds.
Page 129 - An apparent solar day is the interval between two successive transits of the sun's centre across the meridian of any place.
Page 122 - As the planet moves round the sun, its radius-vector (or the line joining it to the sun) passes over equal areas in equal times. To explain these laws, let PA (Fig. 20) be the ellipse in which the planet moves. Then the sun will not be in the cenFio.
Page 129 - A SIDEREAL DAY is the interval of time between two successive upper transits of the vernal equinox over the same meridian.
Page 204 - ... is equal to the probable error of a single observation divided by the square root of the number of observations. The probable error of the mean, hence, decreases as Vw increases.
Page 124 - The parsec is the distance at which a star would have a parallax of one second of arc.
Page 125 - The longitude of a place is the arc of the equator intercepted between the meridian of that place and some assumed meridian to which all others are referred.
Page 56 - triangle of error " is inside the triangle formed by the three fixed points, the position is inside the triangle of error ; and if outside, outside.