CONTENTS S.NO 01 NAME OF THE EXPERIMENT STUDY OF THEODOLITE 02 MEASUREMENT OF HORIZONTAL ANGLES BY REITERATION METHOD 03 MEASUREMENT OF HORIZONTAL ANGLES BYREPETITION METHOD 04 THEODOLIT E SURVEY – TRAVERSING 05 THEODOLIT E SURVEY – HEIGHT AND DISTANCE (BUILDING) 06 DETERMINATION OF TACHEOMETRIC CONSTANTS 07 08 STADIA TACHEOMETRY- DETERMINATION OF THE GRADIENT OF THE LINE SETTING OUT SIMPLE CIRCULAR CURVE - RANKINE'S METHOD OF TANGENTIAL DEFLECTION ANGLES 09 SETTING OUT OF TRANSITION CURVE31 10 SETTING OUT A BUILDING 11 AZIMUTH BY THE EX-MERIDIAN OBSERVATION ON THE SUN 12 FIELD WORK USING TOTAL STATION
STUDY OF THEODOLITE EXP:01 DATE: TRANSIT THEODOLITE:It consists of a telescope which can be revolved through a complete revolution about its horizontal axis in a vertical plane. PARTS:Leveling head, telescope, vertical circle, index frame, A frame lower plate, upper plate, level tubes, plumb bob LEVELING HEAD:The leveling head consists of two parallel triangular planes known as tribrach plates. The upper tribrach has three arms, each carrying a leveling screw. The lower tribrach has three arms each carrying a leveling screw. The lower tribrach plate or foot plate has a circular hole through which plumb bob may be suspended. TELESCOPE:The telescope is an integral part of the theodline and is mounted on a spindle known as horizontal axis or trunnion axis. In most of the transits, internal focusing telescope is used. VERTICAL CIRCLE:The vertical axis is a circular graduated arc attached to the trunnion axis of the telescope consequently the graduated arc rather with the telescope when the latter is turned about the horizontal axis. INDEX FRAME:- The index frame is a T-shaped frame consisting of a vertical leg known as clipping arm and a horizontal bar known as vernier arm of index corm. At the two extremities of the index arm are fitted two verniers to read the vertical circle.
STUDY OF THEODOLITE A FRAME:Two standards resembling the letter A are mounred on the upper plates. The trunnion axis of the telescope is supported on these. LOWER PLATE:The lower plate is attached to the outer spindle. The lower plate carries a horizontal circle at its leveled edge and is therefore also known as the scale plate. UPPER PLATE:- The upper plate or vernier plate is attached to the inner axis and carries two verniers with magnifiers at two extremities diametrically opposite. The upper plate supports the standards.
PLUMB BOB:A plumb bob is suspended from the hook fitted to the bottom of the inner axis to centre of instrument exactly over the station mark. TEMPORARY ADJUSTMENTS OF A THEODOLITE:1.Setting over the station 2.Leveling up 3.Elimination of parallax SETTING UP:The operation of setting up includes centering of instrument over the station mark by a plumb bob and approximate leveling with the help of tripod legs. LEVELING UP:The object of leveling is to make the instrumental axis fully vertical. This is done with the help of three foot screws. 1.First loose the clamp screw and turn the instrument until the longitudinal axis of the bubble tube is parallel to the line joining any two leveling screws. 2.Turn the foot screws uniformly until the bubble comes to centre. 3.Rotate the instrument until the axis of the level tube coincides with the third foot screw. 4.Turn the third screw either inward or outward to make the bubble central. 5.Repeat the above procedure thrice. Rotate the instrument through 180º. And in this position the bubble should remain central otherwise repeat the procedure. ELIMINATION OF PARALLAX:-Parallax is a condition arising when the image formed by objective is not in the plane of cross hairs. It is eliminated by focusing eye piece for distinct vision of cross hairs and forwarding the objective to bring the image of objective in the plane of cross hairs.