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The Ordnance Survey
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accuracy adjusted alignment alternative angular axis backsight band base line bearing and distance bench mark boundary bubble tube building calculated centre hair chain line chain survey chainage Chapter chord clamp collimation line computed contour line correct cross-hairs cross-sections curve difference distance measurement distance measuring equipment dumpy level EDM equipment error eyepiece Figure fixed Gateway Traverse grid ground horizontal angle horizontal distance instrument station intersection known length linear located method metres millimetre minutes of arc misclosure Note observed offset Ordnance Survey photogrammetry photographs plane plate plotting plumb-bob point of detail position printout prism protractor reading rectangular co-ordinates reduced level reference reflector right angles scale map screw Section shown sine rule spot heights square staff holder standard steel tape stereoscope suitable surface surveyor tacheometers tacheometry tangent target techniques telescope theodolite tilting triangle tribrach tripod values vertical angle zero