DETERMINATION OF HORIZONTAL ANGLE (REITERATION METHOD), SURVEY LAB, CIVIL ENGINEERING. скачать в хорошем качестве

DETERMINATION OF HORIZONTAL ANGLE (REITERATION METHOD), SURVEY LAB, CIVIL ENGINEERING.

Aim: To determine the included angle between the given objects (A, B, C and D) by reiteration method. Instruments Required: Theodolite, Tripod, Ranging rods. Procedure: 1. Set the instrument over “O” which should be at the center of the arrangement of the given objects. 2. Do all the initial adjustments and keep the vertical circle to left. 3. Set Vernier A to 0°0’0” , bisect the ground point “A” and turn the telescope to bisect object B by loosening the upper clamp screw and upper tangent screw. 4. Read both Vernier. The mean of the Vernier readings will give the angle AOB 5. In the same way bisect the other objects in clockwise direction and note down the readings. 6. Since the graduated circle remains in a fixed position throughout the entire process, each included angle is obtained by taking the difference between two consecutive readings. 7. On final sight to A the reading of the Vernier should be the same as the original settings. If not, note the reading and find the error due to slips ect., If the error is small, distribute it equally to all angles, if large, repeat the procedure and a fresh set of readings. 8. Do the same procedure with the other face in anticlockwise direction.