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  • (archaeology) in mapping or navigation, a compass direction, or horizontal angle of sight measured in magnetic degrees.
  • (geology)
    Source: Dictionary of Mining, Mineral, and Related Terms
  1. The part of a beam or girder that actually rests on the supports. CTD
  2. Undercutting the coal face by holing. Nelson
  3. The horizontal angle between the meridian (true or magnetic) and any specified direction. The angle is measured from either the north or the south point, as may be required to give a reading of less than 90 degrees , and the proper quadrant is designated by the letter N or S, preceding the angle, and the letter E or W, following it; as, N. 80 degrees E. CF: azimuth
  4. The points of support of a beam, shaft, or axle, i.e., bearing points.
  5. The direction of a mine drivage usually given in terms of the horizontal angle turned off a datum direction, such as the true north and south line. Nelson
  6. In Texas land surveys, a reference point to identify a land corner or a point on a survey line. Seelye, 2
  7. A part in which a shaft or pivot revolves. Nichols, 1
  8. See: ball bearing

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