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Analysis and prediction tide gauges
Taking and fixing positions
Eapid triangulation planetable topo
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accuracy adjustment altitude approximate axis azimuth calculated centre circle clock coincide computed curvature curve determined difference of level direction earth equal equation feet fixed formula geodetic given gives glass Greenwich ground hair height Hence horizontal angle hour angle inch instrument intersected interval known latitude length log sines longitude lunar mark mean sea-level mean square error measured meridian method miles minor triangulation moon moon's Nautical Almanac nautical miles nearly object observed angle obtained Ordnance Survey parallax parallel perpendicular plane plane-table plotted points pole polygon position probable error radius readings refraction right angles right ascension scale screw sextant side sidereal sidereal day signal solar solar day spherical excess square star station subtended subtracted suppose surface survey surveyor tacheometer taken tangent telescope temperature theodolite tidal tide tion transit traverse triangle true vernier vertical angles wire zenith zero