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INTRODUCTION 1 Engineering Surveys
Use of Surveys
Plane and Geodetic Surveying
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approximate probable error azimuth B.Ms bubble tube clinometer co-function compass computed contour corners curvature declination determined difference in elevation dumpy level eliminated engineering errors of adjustment exactly example eyepiece feet long field notes foot footscrews formula graduations ground horizontal angle horizontal axis horizontal cross-hair horizontal distance inch instrument Keuffel and Esser LCtn least count line of sight LSin magnetic bearing magnetic declination measured ment meridian method minutes moved necessary needle readings objective lens obtained plane plate bubbles plumb bob Polaris position precise procedure Prop pull read as printed rear tapeman refraction rod reading sag correction screws set-up shown in Fig sketch slope stadia stake station steel tape surveyor tangent taping pin target telescope bubble tion transit transitman traverse triangulation Trigonometric Functions tripod true length true north two-peg test usually vernier vertical angle vertical axis vertical cross-hair zero