## Elementary Surveying and Map Projection |

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2irR accurately alidade angle of slope back bearing base line calculated centimetre central meridian centre circle clinometer cone conical projection contours correct curved cylindrical projection described diameter direction distance divide draw drawn equal equal-area Equator equidistant fixed globe ground height Hence horizontal equivalent hypotenuse inch latitude latitude and longitude length longitude magnetic bearing magnetic declination map projection marked measured meridian scale meridians and parallels method metres mile north and south observed parallel scale perpendicular plane plane-table plotted plumb-bob pole polyconic polyconic projection radii radius ratio rays reduced earth represent result right angles screw sheet shown side simple conical simple cylindrical sphere spherical cap spirit level squares standard parallel straight line subtended subtract suppose tangent tape theodolite tracing paper traverse triangle of error triangulation stations true vertical interval zenithal projections zero