Compass - Surveying tools and Instruments

Compass - Surveying tools and Instruments

Prismatic Compass

  • Least count is 30 min
  • Graduation provide in only one side i.e Clockwise
  • 0 degree are on a south direction
  • used to measure whole circle bearing
  • Needle is a broad Needle (Not ace as a index)
  • Tripod is not compulsory
  • Sighting and Reading taking can be done simultaneously
  • Prismatic compass with agate cap
  • Graduated ring and needle are connected

Surveyor compass

  • compass-least count is 15 min
  • Graduation provide on both direction i.e. clockwise and anticlockwise
  • zero are on a both north and south direction
  • used to measure reduce bearing
  • Needle is of Narrow Needle.(Act as a Index)
  • Tripod is Compulsory
  • Sighting and reading can not be done simultaneously
  • Box and graduated ring are connected

Trough compass

  • It is used in plane table to mark North direction
  • In this compass two graduated scale are provided with readings

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