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