This document discusses theodolite surveying. It defines a theodolite as an instrument used to accurately measure horizontal and vertical angles. The document outlines the components of a theodolite and different types including transit, non-transit, vernier, micrometer, digital/electronic, and optic theodolites. It also defines various technical terms used in theodolite surveying such as swinging, transiting, face left, face right, and changing face. The main uses and functions of a theodolite are to measure horizontal and vertical angles, magnetic bearings, deflection angles, horizontal distances, and elevations.

1. 2.THEODOLITE SURVEYING
(24 MARKS)
By
Mr. Naufil Sayyad

2. Course outcome ( CO)
b. Prepare plans using Theodolite
surveys.

3. Practical outcomes ( PrOs)
7.Use transit
theodolite to measure
Horizontal angle
correctly by direct
method
8.Use transit
theodolite to measure
Vertical angle correctly
by direct method
9.Use transit
theodolite to measure
Horizontal angle
correctly by Repetition
method
11.Use transit
theodolite to carry out
survey project for
closed traverse for
minimum 5 sides

4. Unit outcomes ( UOs)
2a. Explain the given
components of the
transit theodolite
2b.describe the salient
features and relationship
between the given
fundamental axes
2c.Describe the
procedure to measure
horizontal and vertical
angles using theodolite
for the given situation
2d.Apply checks for
determining the type of
traverse using the given
data
2e.Compute latitude,
departures , consecutive
coordinates,
Independent coordinates
from given data

5. 2f.select relevant
method of theodolite
traversing for given
condition
2g.apply Bowditch’s
rule and transit rule to
balance the traverse
for given data
2h.Tabulate Gale’s
Traverse table for the
given data
Unit outcomes ( UOs)

6. Introduction
Theodolite is an intricate instrument used mainly for
accurate measurement of horizontal and vertical angles up
to 10” to 20” depending upon the least count of the
instrument.
Because of its various uses the Theodolite is sometimes
known as Universal instrument.

7. Uses of Theodolite
1. Measurement of Horizontal angle
2. Measurement of vertical angle
3. Measurement of magnetic bearing of a line
4. Measurement of Deflection angle
5. Measuring the horizontal distance between two points
6. Finding the vertical height of an object
7. Finding difference of elevations between various points
8. Ranging a line

8. Types of Theodolite
Based on type of telescope
Theodolite
Transit
Non
Transit

9. Types of Theodolite
Based on reading unit
Theodolite
Vernier Micrometer Digital/Electronic

10. Vernier Theodolite
Digital/Electronic
Theodolite
Micro Optic Theodolite

11. Component parts of Theodolite

12. Telescope
Altitude bubble
Vertical
Clamping screw
Trunnion axis

13. Vertical Circle
Eye piece
Plate level
Upper plate
Vernier A/B
Lower Plate
Inner spindle
Outer spindle20

14. Tribrach
Levelling screw
Trivet

16. Technical terms
Swinging
 It indicates turning the telescope in the horizontal
plane.
 It is called Right swing when telescope is turned
clockwise and left swing when telescope is turned
anticlockwise.

17. Technical terms
Transiting
The method of turning the telescope about its
horizontal axis in a vertical plane through 180° is
termed as transiting.
In other words transiting results in change in
face.

18. Technical terms
Face left
Face left means the vertical circle of the
theodolite is on the left of observer at the time
of taking readings.
The observation taken in the face left position is
called as face left observation

19. Technical terms
Face Right
Face right means the vertical circle of the
theodolite is on the right of observer at the time
of taking readings.
The observation taken in the face right position
is called as face right observation.

20. Technical terms
Changing face
The operation of bringing the vertical circle
from one side of the observer to other is called
as Changing face.