Introduction to the Brunton Compass

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Presentation transcript:

Introduction to the Brunton Compass Parts of the Compass Uses of the Brunton Compass - Bearing - Strike and Dip - Trend and Plunge Map Symbols Text: Compton, p. 16-21; 34-39; Measurement of Attitude and Location; Lab 1 (website)

Parts of the Compass Compass Face - Arrow (white tip North) - Directional Degrees (Quadrant or Azimuth) Clinometer: Scales in Degrees and % Grade Levels - Bullseye Level - Cylindrical Level Mirror Sighting Arm Dampener Magnetic Declination (~6.5° E of N)

Uses of the Brunton Compass Locate North Sight Angles - measuring height / thickness of a feature Bearing Strike and Dip Trend and Plunge

Bearing Bearing: direction from one point to another point. 1-directional line Quadrant Notation: N or S____° E or W Azimuth Notation: _____° Note: With sighting arm pointing to object, always read the white tip of the needle.

Strike and Dip Strike: Direction of the line of intersection between a tilted plane and a horizontal plane. 2-directional line Azimuth Notation: _____ ° Note: Read the end of compass needle that makes dip direction to the right of the strike direction (Right-Hand-Rule).

Note: If use Right-Hand-Rule, dip direction is implied. Strike and Dip Dip: Angle between a tilted plane and a horizontal plane that is perpendicular to strike. Maximum angle ( ≤ 90º ) Notation: ____ ° N, S, E, W, NE, NW, SE, SW Note: If use Right-Hand-Rule, dip direction is implied.

Cross-Section: Dipping Strata W E Horizontal Dip Angle (E. McBride) Cross-Section: Dipping Strata

Cross-Section: Dipping Strata W E Horizontal Dip Angle (E. McBride) Cross-Section: Dipping Strata

Aerial View: Strike of Dipping Strata (E. McBride)

Trend and Plunge Trend: bearing of a linear feature. 1-directional Line Measured in Direction of Plunge Azimuth Notation: _____° Plunge: angle between a tilted linear feature and a horizontal plane. Notation: ____° Note: written as plunge, bearing

Trend and Plunge Linear Glacial Striations (Maine)

Map Symbols (map view) strike and dip strike and dip (vertical) strike and dip (horizontal) 45º

Bring to Lab Course Packet Brunton Compass Field Notebook Ruler (metric) Protractor Calculator (tangent) Clipboard