## An Elementary Text Book on Land Surveying |

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accuracy adjustment arrow back sight bench mark calculate centre line chain line clinometer collimation line colour column compass contour lines convenient cross hairs curve diaphragm difference direct the telescope distance divided draw Dumpy Level equal error exactly eyepiece feet Field Book figure fixed fore sight ground hedge height horizontal angle inch instrument intersection land length lens line of collimation means measured method micrometer move needle North object glass obtained offsets Ordnance Datum parallax parallel perp perpendicular plot plumb-bob position primary scale radius ranging rods reduced level right angles sextant shown in Fig side sights and fore sine rule slope spirit level square stadia lines straight lines subtracting Suppose survey lines surveyor tacheometer taken tangent screw tangential angle theodolite tracing paper traverse triangle usually vertical arc vertical axis whole circle bearing zero