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Calculation of Distances Slope and
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accuracy adjustment altitude aneroid angular applied approximate astrolabe astronomical axis azimuth base bearing calculated centre chronometer co-ordinates coefficient computed conditional equations correction cosec determined difference direction earth elevation Empire Survey Review eyepiece figure formula Gee-H Geodesy Geodetic Survey geodimeter give given graduations ground Hence horizontal hour angle instrument intervals invar length line of sight logarithms longitude machine mark mean measured method micrometer miles normal equations observation equations obtained ordinary Ordnance Survey orthomorphic parallel photographs plane pole position prime vertical prism probable error projection quantity radar reading rectangular spherical refraction right ascension scale screw sea level side sidereal signals spherical excess spheroid spirit level standardised star station surface Surveyor taken telescope tellurometer temperature theodolite tion transit Transverse Mercator triangle trigonometrical trilateration tripod Troughton & Simms vertical circle weight wires zero