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Chain surveyinglinear measurement
Fieldworkchain surveylinear measurement
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90 degrees accuracy accurate adjustment alidade altitude bubble attached automatic level backsight base bearing bisect bubble tube building calculated centre chain survey chainage changepoint chord circle reading collimation line contour correct cross-hair cross-sections curve detail direction distance measurement drawing dumpy dumpy level error example exsecant eyepiece face left face right floor foot screws foresight graduated grid ground hair height horizontal intersection line length located maps mark method metres micrometer millimetre noted observed obtained offset optical plummet Ordnance Survey parallax partial co-ordinates pegs photographs plane table plotting plumb-bob position precise prism reduced levels right angles setting-out sheet shown in Figure sight line slope stadia staff reading standard staves steel tape stereoscope straight suitable tacheometer tacheometry tangent screw target telescope theodolite tilting level transit axis traverse triangle tribrach tripod upper clamp vernier scale vertical angle vertical circle