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Which of the following is the most convenient and portable tool for the direct computation of directions (i.e. horizontal angles)?
1. Prismatic compass
2. Sextant
3. Surveyor's compass
4. Dumpy level

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Correct Answer - Option 1 : Prismatic compass

Concept:

Prismatic compass:

  • It is the most convenient and portable form of a magnetic compass which can either be used as a hand instrument or can be fitted on a tripod.
  • The greatest advantage of a prismatic compass is that both sighting the object as well as reading the circle can be done simultaneously without changing the position of the eye.

Surveyor's compass:

  • Surveyor compass is an instrument used for the measurement of horizontal angles and the bearing of a line of sight.
  • It is used with the tripod.

Sextant:

  • A sextant is an instrument used for measuring the angle between two visible objects.
  • Both horizontal and vertical angles can be measured using a sextant.

Dumpy level:

  • The dumpy level is a commonly used leveling instrument to locate the points in the same horizontal plane.
  • Elevations of different points and distance between the points of the same elevation can be determined by dumpy level. 

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