Department of Technology

ENG 200 - Surveying

Spring 2004

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Lab 6 - Vertical Angles

Purpose:

This lab will introduce you to the procedures used to turn vertical angles using a transit or theodolite.  It will also introduce you to the use of trigonometry to indirectly determine heights and distances.

Equipment Required:

  • Digital transit or theodolite
  • Tripod
  • 100-foot steel tape (chain)
  • Chaining pins

Procedure:

Traverse stations D and E are located near the Center for the Arts. You are to locate those points and do the following:

  1. Measure the horizontal distance from the center of the flagpole to transit station E.

  1. Occupy ttransit station E, set the horizontal angle to 0° 00’, sight on transit station D and turn:

    • Vertical angles to the tip of the highest dragon’s nose.
    • Horizontal angle from the other transit station to the tip of the highest dragon's nose.
    • Vertical angles to the top and bottom of the flagpole.

  2. Occupy transit station D, sight on transit station E, and repeat the first two steps above.

  3. Measure the horizontal distance between transit stations D and E.

  4. Given the angles and distances, determine the height of the flagpole. Use the horizontal distance and the two vertical angles to determine the vertical distances from the transit h.i. up to the top and down to the base.

  5. Calculate the horizontal distance from each transit station to the dragon's nose using the sine law.

  6. Assuming that the ground beneath the dragon is at the same elevation as the base of the flagpole, determine the height of the dragon's nose above the ground. You will have enough information to average two answers. Use the noteform shown below.

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