compass_techniques - Compass Techniques I. The Brunton...

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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
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This note was uploaded on 10/02/2011 for the course GEOLOGY 406 taught by Professor Taylor during the Spring '11 term at Western Oregon University.

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compass_techniques - Compass Techniques I. The Brunton...

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