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THE PRINCIPLES OF LAND SURVEYING
Units of Length Units of Area Instruments used on simple
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accuracy adjustment alidade arrow back sight bearing bench mark bubble calculated centre line chain line circle clamp clinometer collimation line compass contour lines correct cross hairs diaphragm difference direct the telescope distance draw Dumpy Level edge equal error eyepiece feet Field Book figure fixed fore sight ground height horizontal angle inch instrument intersection land length lens line of collimation line of sight means measured method micrometer move needle object glass obtained offsets Ordnance Datum Ordnance Survey parallel perpendicular plane table plotted plumb-bob position primary scale radius ranging rods reading reduced level right angles sextant shown in Fig side sights and fore sine rule slope spirit level square stadia lines staff straight lines survey lines surveyor tacheometer taken tangent screw tangential angle theodolite tracing paper traverse triangle turn usually vernier vertical arc zero