Class notes 4 - Compass Techniques I The Brunton Compass A...

Info icon This preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Compass Techniques I. The Brunton Compass A. Parts of the Brunton Pocket Transit 1. compass- measuring magnetic bearing 2. clinometer- measuring vertical inclination of planes 3. hand level- sights for line surveying a. mechanisms (1) clinometer level = use for taking vertical angles (2) bullseye level = use for taking compass readings (3) graduated circle (4) compass needle (5) sighting arm (6) sighting window (7) declination adjusting screw (8) lid with mirror (9) lift pin/needle brake B. Making Compass Readings 1. Set magnetic declination a. use adjusting screw b. refer to topo map or mag. dec. charts 2. Compass bearings = line orientations in space relative to geographic directions (quadrant vs. azimuth methods) a. open lid with sighting arm extended b. center bull's eye bubble c. align compass along desired line d. read bearing indicated by white end of compass needle e. check bearing and record (1) warnings: watch for magnetized objects that could alter compass reading (a) Fe-rich rock bodies can only use sun compass C.
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern