ECG2013 (L)Engineering SurveyLab Report 3: Compass Survey

Group members:1.Muhammad Redza Shyazril Bin.Ramli PTM 1307073582.Muhammad Asyraf Bin AzharPTM130707644 3.Muhammad Al Hafiz Firdaus Bin Abdul Halim PTM 1307074134.Muhammad Sahmmir Bin BaharudinPTM1307077515.Saiful Husni Bin Awaluddin NasirPTM1307077316.Muhammad Amirul Ashraff Bin Mohd SapuanPTM130707421Section: 1Submission date: 6/4/2015Lecturer: Sir Syed Syahril Syazwan Bin Syed Illias ECG 2013(L)SURVEY PRACTICALLAB REPORT GRADING( Please attach this scoring sheet at the first page of the report )LAB REPORT

ITEMSSTUDENT SCOREMAX SCORE

1INTRODUCTION5

2OBJECTIVES5

3APPARATUS5

4PROCEDURES10

5RESULTS (DATA AND ANALYSIS) + SAMPLE OF CALCULATION25

6DISCUSSIONS5

7CONCLUSIONS5

8REFERENCES5

9APPENDICES5

SUBTOTAL70

FIELD WORK

GROUP MEMBERSSTUDENTS SCOREMAX SCORE

1ATTENDANCE5

2RECEIVED INSTRUCTION5

3USED EQUIPMENT10

4TEAM WORK5

55 S5

SUBTOTAL30

LAB REPORT70

TOTAL100

IntroductionAprismatic compassis asurveyinginstrument which is extensively used for calculating bearings of survey lines and included angles between them. The compass calculates bearings of lines with respect tomagnetic 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 180iflocal attractionis negligible. The namePrismatic compassis 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 north- south 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.ii. To measure bearings of the traverse by using prismatic compass survey and do the correction (if any)

Equipment:1. Prismatic compass survey + tripod2. Ranging pole3. Hammer4. Arrows5. 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: