Outline of the Method of Conducting a Trigonometrical Survey, for the Formation of Geographical and Topographical Maps and Plans: Military Reconnaissance, Levelling, Etc.; with the Most Useful Problems in Geodesy and Practical Astronomy, and Formulæ and Tables for Facilitating Their CalculationJohn Weale, 1862 - 277 стор. |
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accuracy acres adjustment altitude angles of elevation apparent ascertained astronomical axis azimuth barometer base boundaries calculated centre chain chronometer circle computed contour lines correction course curvature declination degree depression determined difference of longitude direction divisions earth equal feet field-book fixed Géodesie given Greenwich Greenwich mean ground height hour angle inches index error instrument intersection laid latitude length limb lunar distance marked mean noon mean solar measured meridian method miles minute moon's Nautical Almanac necessary object obtained Ordnance Survey parallax parallel perpendicular pickets place of observation plane plotted pole portable portions purpose radius reading reduced refraction right ascension roads scale screw sections semidiameter sextant sidereal sides sketch slopes spherical spherical excess spirit level star stations subtracted sun's surface Table taken tangent telescope temperature theodolite thermometer tion tracing transit triangles trigonometrical points Trigonometrical Survey tube vernier wire zenith distance zero