Lab Report Compass Survey

ECG2013 (L) Engineering Survey Lab Report 3: Compass Survey

Group members:

1.Muhammad Redza Shyazril Bin.Ramli

PTM 130707358

2.Muhammad Asyraf Bin Azhar

PTM130707644

3.Muhammad Al Hafiz Firdaus Bin Abdul Halim

PTM 130707413

4.Muhammad Sahmmir Bin Baharudin

PTM130707751

5.Saiful Husni Bin Awaluddin Nasir

PTM130707731

6.Muhammad Amirul Ashraff Bin Mohd Sapuan

PTM130707421

Section: 1 Submission date: 6/4/2015 Lecturer: Sir Syed Syahril Syazwan Bin Syed Illias

ECG 2013(L) SURVEY PRACTICAL LAB REPORT GRADING ( Please attach this scoring sheet at the first page of the report ) LAB REPORT ITEMS 1 2 3 4 5 6 7 8 9

1 2 3 4 5

STUDENT SCORE

INTRODUCTION OBJECTIVES APPARATUS PROCEDURES RESULTS (DATA AND ANALYSIS) + SAMPLE OF CALCULATION DISCUSSIONS CONCLUSIONS REFERENCES APPENDICES SUBTOTAL FIELD WORK GROUP MEMBERS STUDENTS SCORE ATTENDANCE RECEIVED INSTRUCTION USED EQUIPMENT TEAM WORK 5S SUBTOTAL LAB REPORT TOTAL

MAX SCORE 5 5 5 10 25 5 5 5 5 70 MAX SCORE 5 5 10 5 5 30 70 100

Introduction A prismatic compass is a surveying instrument which is extensively used for calculating bearings of survey lines and included angles between them. The compass calculates bearings of lines with respect to magnetic north. The included angles can then be calculated using suitable formulas in case of clockwise and anti-clockwise traverse respectively. For each survey line in the traverse, surveyors take two bearings that is fore bearing and back bearing which should exactly differ by 180 ° if local attraction is negligible. The name Prismatic compass is given to it because it essentially consists of a prism which is used for taking observations more accurately.

In Compass survey chain or tape is used for linear measurements and compass is used for fixing direction. The compass freely suspended magnetic needle directs to northsouth and the bearing of line is obtained by line of sight.

Objective:

i.

To introduce the equipment used in level measurement hence execute the fieldwork. To measure bearings of the traverse by using prismatic compass survey and do the correction (if any)

ii.

Equipment: 1. 2. 3. 4. 5.

Prismatic compass survey + tripod Ranging pole Hammer Arrows Tape

Procedure: 1. With length of 20 m, at least six points (CP) had to established at the desired site. At the ground, drive the nail at the proposed stations.

20 m

20 m

20 m

20 m

20 m 2. Set the compass at Station A and with the arrow, centered the compass by using the plum bob. 3. Adjust the compass for observation of bearings and also observe the magnetic north to determine the lines and also the magnetic bearings that had to be observed. In sheet 2, the readings are taken and then recorded. 4. Set to move to another station together with the compass, the tripod and also the plum bob. Step 3 then is repeated.

Discussion: Include a brief discussion with your reports:



Can the students be able to use and set up the apparatus needed in this experiment correctly?



Did the students managed to take measurement correctly?



What is the difference between the Fore bearing and the back bearing?



How to distinguish between them?

Conclusion: From the experiment that we conducted, we can conclude that the fore bearing is when we take a level at the site in forward direction, while the back bearing is the opposite to back bearing, that is the back bearing.

References: 1. Engineering survey laboratory manual [ECG 2013 L]. 2. Engineering survey [ECG 2013 ] note books.

Appendices: