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 . The compass freely suspended magnetic needle directs to northsouth and the bearing of line is obtained by line of sight. surveyors take two bearings that is fore bearing and back bearing which should exactly differ by 180 ° if local attraction is negligible. The compass calculates bearings of lines with respect to magnetic north.Introduction A prismatic compass is a surveying instrument which is extensively used for calculating bearings of survey lines and included angles between them. For each survey line in the traverse. Objective: . The included angles can then be calculated using suitable formulas in case of clockwise and anti-clockwise traverse respectively. In Compass survey chain or tape is used for linear measurements and compass is used for fixing direction. The name Prismatic compass is given to it because it essentially consists of a prism which is used for taking observations more accurately. drive the nail at the proposed stations. 3. Set the compass at Station A and with the arrow. at least six points (CP) had to established at the desired site. Discussion: Include a brief discussion with your reports: . In sheet 2. 2. To introduce the equipment used in level measurement hence execute the fieldwork. Equipment: 1. At the ground. the readings are taken and then recorded. 4. Step 3 then is repeated. centered the compass by using the plum bob. 4. 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. 20 m 20 m 20 m 20 m 20 m 2. the tripod and also the plum bob. Prismatic compass survey + tripod Ranging pole Hammer Arrows Tape Procedure: 1. 5.i. With length of 20 m. 3. Set to move to another station together with the compass. To measure bearings of the traverse by using prismatic compass survey and do the correction (if any) ii. Engineering survey [ECG 2013 ] note books. References: 1. 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. while the back bearing is the opposite to back bearing. that is the back bearing. Engineering survey laboratory manual [ECG 2013 L]. 2. we can conclude that the fore bearing is when we take a level at the site in forward direction. Appendices: .