THEODOLITE DEFINITION

THEODOLITE  DEFINITION

The frequently used terms in measurement Process using Theodolite. Are as follows,

(1) Transit:

This is the Operation of revolving the telescope through 180 in. Plane about its horizontal axis.

(2) Face Right:

When the vertical circle of a theodolite is on the right of the observer, the position is called face right and the observation made is called face right observation.

(3) Face Left:

·        when the vertical circle of a theodolite is in the left of the observer, the position is called is called face left observation,

·        By taking the mean of both face readings, the collimation error is eliminated

(4) Swinging the Telescope:

·        Revolving in telescope the horizontal Plane, a the in the horizontal Plane, about the vertical axis is called swinging.

·        Right swing means clock wise solation of the telescope.

·        Left swing means Anti-clock wise rotation of the telescope.

(5) Telescope Normal:

The Telescope is said to be normal when Its vertical circle is to the left of the observer and the bubble is up.

(6) Telescope Inverted:

The Telescope is said to be Inverted when its vertical circle is to the right of the observer and the bubble is down.

(7) Horizontal axis:

It is the axis about which the telescope can be rotated a vertical Plane. 

(8) Vertical axis:

It is the axis about which the telescope can be rotated in a horizontal Plane. 

(9) Axis of Telescope:

It is the line Joining the optical centre of the object glass to the centre of the exe-Piece 

(10) Line of sight:

It is an imaginary line Joining the intersection of cross hairs to the optical centre of the objective and its continuation.