What is Theodolite, Uses of Theodolite and types of Theodolite

What is Theodolite

Theodolite is the instrument which is mainly used for taking horizontal and vertical angle up to 10" or 20" depending upon the least count of the instrument.

Uses of Theodolite

There are many uses of Theodolite, the following are the different purposes for which the theodolite can be used..

1. Measuring Horizontal Angle

2. Measuring Vertical Angle

3. Measuring Deflection Angle

4. Measuring Magnetic Bearing

5. Measuring Horizontal distance between two points

6. Finding Vertical Height of an object

7. Finding the different of elevation between various points

8. Ranging a Line

How many Types of Theodolite

Theodolite may be of two types

1. Transit Theodolite

2. Non - Transit Theodolite

Transit Theodolite :- In Transit Theodolite, the telescope can be revolved through a complete revolution about its horizontal axis in a vertical plane

Non - Transit Theodolite :- In Non - Transit Theodolite, the telescope can be revolved through a complete revolution in the vertical plane But it can revolved to a certain extent in a vertical plane, in order to measure the angle of elevation or depression.

What is Transiting of a Theodolite

The method of turning the telescope about its horizontal axis in a vertical plane through 180° is termed as transiting .

What is Swinging The Telescope

This indicates turning of the telescope in a horizontal plane . It is called right swing when the telescope is turned clockwise and left swing when the telescope is turned anticlockwise

What is axis of the telescope

The axis of the telescope is the imaginary line passing through the optical centre of the object glass and the optical centre of the eyepiece

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