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Which of the following statements is not correct?


1.  A through compass in an accessory to a plane table.
2.  A surveyor's compass has two sight vanes.
3.  In a prismatic compass, the graduations on the aluminum disc rotate the index remains stationary
4.  A prismatic compass has an object vane and an eye vane

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Correct Answer - Option 3 :  In a prismatic compass, the graduations on the aluminum disc rotate the index remains stationary

Explanation:

The magnetic compass is a device by which we establish the orientation of the magnetic north. In surveying, there are two compasses that we use in the field.

  • Prismatic compass
  • Surveyor’s compass

 Prismatic compass

      Surveyor’s compass

A broad form needle is used.

An edge bar needle is used.

The needle is hidden below the aluminum disk and it does not act as an index.

The needle is above the graduated disk it acts as an index.

Works on whole circle bearing system.

Works on the quadrantal bearing system.

This compass can be held in the hand while taking readings

This compass can not be used without a tripod.

 

Note: The compass used with a plane table is a trough compass in which the longer sides of the trough are parallel and flat so that either side can be used as a ruler or lid down to coincide with a straight line drawn on the paper. A trough compass is used for orienting the plane table to the magnetic north.

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